人一個的雜記

We are sorry that we only deal with problems related to networking and data communications. However, your request is beyond the scope of our service, so we are unable to help.

Should you have other enquiries regarding the field of connection, please feel free to contact us again.

Check Proxy (Internet Explorer)

If you are using IE as your web browser, pleaes kindly check:

- Start your Internet Explorer
- Select "Tools -> Internet Options"
- Click the "Connection" tab, then click the "LAN Connection" button and see if there is any proxy server enabled. If yes, uncheck the option.
- Repeat the same step by select your VPN connection, then "Settings"
- Click the Ok button to save the change.

Please try it out.

If you still face the same problem after trying the suggestions, please feel free to contact us again, thank you.

Disable and Enable Local Area Connection

It is due to the fast startup feature in WindowsXP. It could take less than 30 seconds to start the WindowsXP in PC's with fast CPU. In such case, there would not have be sufficient time for getting an IP from the DHCP server.

To re-obtain a correct IP address(10.0.xxx.yyy),
1. Go to ""Control Panel"", double-click ""Network Connection""
2. Right click on the icon ""Local Area Connection"", select ""Disable"" and wait, then a red cross would then be displayed display next to the ""Local Area Connection"" icon
3. Right click on the icon ""Local Area Connection"" again, select ""Enable"""

Should you have further enquiries, please feel free to contact us again, thank you.

Enable Local Area Connection

From your information provided, it seems that your Local Area Connection has been disabled (or your LAN adapter is not properly installed). In order to connect to our VPN service, you have to first properly install LAN adapter and ensure that Local Area Connection is enabled.

To enable Local Area Connection:
1. Go to "Control Panel", click "Network and Internet Connections" and then click "Network Connections"
2. Right click on the icon "Local Area Connection", select "Enable""

Should you have further enquiries, please feel free to contact us again, thank you.

Error 1747

The error 1747 occurs when the "Client for Microsoft Networks" option is not installed.

1) Click "START", go to "CONTROL PANEL"
2) Choose "Network Connection"
3) Right click your vpn logo, choose "PROPERTY"
4) Go to "Networking", click "install"
5) Choose "Service", click "Add"
6) Choose "Client for Microsoft Network"
7) Click "Confirm"

Try to connect VPN again. If it fails, try to restart your PC and connect VPN again. Should you have further enquiries, please feel free to contact us.

Error 619

A. The Error 619 is usually caused by wrong setting in your VPN connection.

You may correct the Security section of your VPN connection to solve the problem.
(Please refer to the user guide in the ITSC homepage for VPN, at http://www.cuhk.edu.hk/itsc/network/vpn/vpn.html)

B. Firewall setting

It is due to the Firewall setting in your PC. Firewall is a system designed to prevent unauthorized access to or from a private network. Some have default settings that crash with VPN connection. At the moment, the ITSC does not recommend users to enable Firewall setting in their Virus Scanner and other internet security programs."

If you still face the same problem after trying the suggestions, please feel free to contact us again, thank you.

Error 691

Error 691 may due to the following problem:

A. multiple login

For the service of ResNet, ClassNet and Dialup (including connection via public ISP with VPN), multiple login is not allowed i.e. If you are using any of the above services, you would not be able to use any other services at the same time. Your problem is probably that someone was using your CWEM computing ID to make a connection. To solve this, just disconnect the other connection you made and connect to the VPN again.
You may also provide us the time of failure so that we can check your connection records and confirm this finding.

B. unterminated VPN session

It was because there was another idle connection initiated from your account left in the system. Please inform our administrator to remove it.
This is not the kind of problem that happens regularly. However, in case the same problem happens again, we suggest users to wait for some 30 minutes, then try again to connect to ResNet. You are also advised to disconnect to ResNet manually before shutting down your PC.

C. CWEM account disabled

You may check if you can login to CUHK webmail using your CWEM account at
http://webmail.cuhk.edu.hk
If you fail to login, you may have entered a wrong computing ID or password. Please check them again.

You can also view our knowledge base for more details
https://helpdesk.itsc.cuhk.edu.hk/kms/kblistentryAction?entryID=0000000088

Error 733 (L2TP)

You may follow the instructions below in order to fix your problem.

A. On the client disable the "Negotiate multi-link for single link connections" setting. To do this:
1. Start > Settings > Control Panel
2. Open "Network and dial-up Connections"
3. Right click the VPN network connection giving the problem and select "Properties"
4. On the "Networking" tab, click "Settings"
5. Clear the check-box "Negotiate multi-link for single link connections"

B. Check that the server is assigning or specifying TCP/IP addresses to user.
(Automatically obtain IP address from DHCP server.)

C. Check that the network protocol TCP/IP is installed in your system
(Note: Right-click Local Area Network button/The VPN connection icon and check this protocol entry in the list or not)

If your problem still exists, please feel free to contact us again, we are glad that we can help you, thank you.

Error 733 (through Broadband)

It seemed that your computer could not locate our VPN server via the network. To let us further check your network status AFTER you made connection to your ISP, please run the following command:

- Select "Run" from the Start menu,
- Enter the command "command" (for win98/me) or "cmd" (for Win2000/XP)
- Click the Ok button

Issue the following commands:

ipconfig /all
ping vpn.cuhk.edu.hk
route print
netstat -n

Please let us know all results you obtained. We'd try to figure out the problem you encountered.

By the way, did you run any personal firewall package such as ZoneAlarm or Norton Internet Security?

Error 734

Error 734 is due to incorrect setting in your VPN connection properties. To resolve this behavior, follow these steps:

1. Click Start, point to Connect To, and then click your dial-up connection.
2. Click Properties, and then click the Options tab.
3. Click to clear the "Include Windows logon domain" check box (if it is selected), and then click OK.
4. Click "Connect".
-If this procedure resolves the issue, and you can establish a dial-up connection; you do not need to follow the remaining steps in this article.
-If this does not resolve the issue, and you cannot establish a dial-up connection, go to step 5 to further troubleshoot this issue.

5. In the Connect dialog box, verify that your user name and password are correctly typed in the User name and Password boxes, and then click Dial.
- If this procedure resolves the issue, and you can establish a dial-up connection;
- If this does not resolve the issue, and you cannot establish a connection, please provide with us the following information:
a. Your whole error message / error code prompted or encountered;
b. Click START and RUN, then type "command" ("cmd" for Win2000 / WinXP users), type "ipconfig /all" and tell us the results;
c. Click START and RUN, then type "command" ("cmd" for Win2000 / WinXP users), type "arp -a" and tell us the results;
d. The version of your windows (e.g., Win98 / WinMe or WinXP?);
e. Your contact number for easy communication;
f. Your hostel address;
g. Your port number;
h. Are you using a notebook or a desktop computer?

We hope the above solution can help you to solve your problem. If you have further problem, please feel free to contact us.

Error 752

Error 752 may be caused by the IP assigned to you last time is still cached,
and Microsoft Windows try to get back that IP result in server conncetion fail.

Please try the following to see if it works

A. Release then renew IP

To re-obtain a correct IP address (10.0.xxx.yyy),
1. Click the "START" menu and then select "RUN...".
2. Type "command" and press "OK".
3. A command prompt window will appear.
4. Type "ipconfig /release_all" and press "ENTER". Retry a few times if it fails to get an "0.0.0.0" IP Address.
5. If it still fails, unplug your LAN cable from the ResNet port and try again. (This step is very important)
6. Plug your LAN cable back to the ResNet port.
7. Type "ipconfig /renew_all" and press "ENTER". Retry until you obtain a "10.0.0.0" IP address.

B. Re-installing the VPN adapter.

Another possible cause is that your VPN adapter setting is corrupted accidentally for some unknown reasons. You could solve this by re-installing the VPN adapter.
1. Click the "START" menu, select "SETTINGS" and then "CONTROL PANEL".
2. In the Control Panel window, select."ADD/REMOVE PROGRAMS".
3. Under Add/Remove Programs, go to the Windows Setup tab, select "COMMUNICATIONS", then click into "DETAILS".
4. In the "Communications window", check the box "VIRTUAL PRIVATE NETWORKING", then uncheck other boxes unless you understand their usage. Press "OK".
5. The system may ask you for the Windows setup disks to install the required files. After installation, the system will prompt you to restart your Windows. Click "YES" to confirm.

C. Wrong security setting

Error 752 may also caused by wrong setting in your VPN connection.
Please carefully check our page to make sure the security setting in your computer is correct:
http://www.cuhk.edu.hk/itsc/network/vpn/vpn.html

You can also view our knowledge base for more details
https://helpdesk.itsc.cuhk.edu.hk/kms/kblistentryAction?entryID=0000000087

If you have further enquiries, please feel free to contact us again, thanks.

Error 768 (L2TP)

Error 768 is caused by the termination of system service. Please try the following:
1. Right click "My Computer" and click "Manager"
2. Under the catagory "Service and application", choose "service"
3. Look for "IPSEC service". Check that this service is running.
4. If not, please start the service by double-click the entry and click the "Start" button in the prompted window.

We hope this can solve your problem. If you have any further problem, please feel free to contact us.

Error 769 (L2TP)

Error 769 may be due to wrong Hostname. Please refer to the following website for VPN client setup:
http://www.cuhk.edu.hk/itsc/network/vpn/winxp_setting.html
Please make sure that you have type in "ipsec-vpn.resnet.cuhk.edu.hk".

Also, please try to renew your IP address after you setup your VPN client:

To get a correct IP address
============================
A. Release then renew IP

To re-obtain a correct IP address(10.0.xxx.yyy),
1. Click the START menu and then select "RUN...".
2. Type "cmd" and press "OK".
3. A command prompt window will appear.
4. Type "ipconfig /release" and press "ENTER". Retry a few times if it fails to get an "0.0.0.0" IP Address.
5. If it still fails, unplug your LAN cable from the ResNet port and try again. (This step is very important!)
6. Plug your LAN cable back to the ResNet port.
7. Type "ipconfig /renew" and press "ENTER". Retry until you obtain a "10.0.0.0" IP address.

B. Disable then enable Local Area Connection

It is due to the fast startup feature in WindowsXP. It could take less than 30 seconds to start WindowsXP in PC's with fast CPU, such as Pentium4. In such case, there would not have sufficient time for getting an IP from the DHCP server.

To re-obtain a correct IP address(10.0.xxx.yyy),
1. Go to "Control Panel", double-click "Network Connections"
2. Right click on the icon "Local Area Connection", select "Disable" and wait, then a red cross would display next to the "Local Area Connection" icon
3. Right click on the icon "Local Area Connection" again, select "Enable"

Then run "ipconfig /all" and see if a 10.0.xxx.yyy address is obtained or not.

If you have further problem, please feel free to contact us. Also, if your problem presist, please reply us with your error messages and situations, IP address you obtained in "ipconfig" and socket label.

Error 769 (PPTP)

Error 769 may due to the lan card driver problem,
It may be corrupted accidentally for some unknown reasons.
You could solve this by re-installing the lan card driver.

Before the installation, Please make SURE you already have an updated lan card driver in your hand.

1. Click START, then SETTINGS and go to CONTROL PANEL;
2. Click SYSTEMS;
3. Click the HARDWARE tab; (For Win2000 / WinXP users, please click the DEVICE MANAGER button also);
4. Under the NETWORK ADAPTER, you should find your LAN card's model;
5. Right-click on the name of your LAN card, choose UNINSTALL;
6. Click OK and reboot your computer;
7. The system will then automatically search for your LAN card;
8. Follow the NEW HARDWARE INSTALLATION WIZARD as instructed to install your LAN card;

If you have further enquiries, please feel free to contact us again, thank you.

Error 769 w/o Further Information

Error 781 (L2TP)

From the error you reported, the error is probably due to the incorrect setting of the IPSec.
You have to enable the IPSec preshared key as discussed on the guide-line at http://www.cuhk.edu.hk/itsc/chinese/network/vpn/cwinxp.html
1. Go to "Start"-> "Control Panel" -> "Network Connections".
2. Right click the VPN Dialup icon, select "Properties".
3. At the "Security" Tab, You should see a "IPSec Settings..." button.
4. Click on "IPSec Settings..." and check the box "Use pre-shared key for authentication"
5. Enter the key "ipsec-vpn" and press "OK"
6. Try to connect again.

If you still have any problem on connecting to resnet, please feel free to submit problem at http://helpdesk.itsc.cuhk.edu.hk.

Error 800

Error 800 in window XP/2000 may due to many reason (e.g. wrong server name, firewall)

Please try out the following solution:

A. Release then renew IP

To re-obtain a correct IP address(10.0.xxx.yyy),
1. Click the START menu and then select "RUN...".
2. Type "cmd" and press "OK".
3. A command prompt window will appear.
4. Type "ipconfig /release" and press "ENTER". Retry a few times if it fails to get an "0.0.0.0" IP Address.
5. If it still fails, unplug your LAN cable from the ResNet port and try again. (This step is very important!)
6. Plug your LAN cable back to the ResNet port.
7. Type "ipconfig /renew" and press "ENTER". Retry until you obtain a "10.0.xxx.yyy" IP address.

B. Disable then enable Local Area Connection

It is due to the fast startup feature in WindowsXP. It could take less than 30 seconds to start WindowsXP in PC's with fast CPU, such as Pentium4. In such case, there would not have sufficient time for getting an IP from the DHCP server.

To re-obtain a correct IP address(10.0.xxx.yyy),
1. Go to "Control Panel", double-click "Network Connections"
2. Right click on the icon "Local Area Connection", select "Disable" and wait, then a red cross would display next to the "Local Area Connection" icon
3. Right click on the icon "Local Area Connection" again, select "Enable"
Then run "ipconfig /all" and see if a 10.0.xxx.yyy address is obtained or not.

C. Incorrect hostname

You may have entered an incorrect hostname for your VPN connection.
If you are connecting to the VPN in hostels, you should use ResNet. Please type "vpn.resnet.cuhk.edu.hk" for the hostname when setting a new VPN connection.
If you are connecting to the VPN in classrooms or some area in CUHK, you should use ClassNet. Please type "vpn.classnet.cuhk.edu.hk" for the hostname when setting a new VPN connection.
If you are connecting to the VPN at home or outside CUHK campus, you should use CUHKnet. Please type "vpn.cuhk.edu.hk" for the hostname when setting a new VPN connection.

D. Firewall

It is due to the Firewall setting in your PC. Firewall is a system designed to prevent unauthorized access to or from a private network. Some have default settings that crash with VPN connection. At the moment, the ITSC does not recommend users to enable Firewall setting in their Virus Scanner and other internet security programs.

E. Line speed

Similar to case B, it is due to the communication failure between your PC and the VPN server.

1. Click the START menu and then select "CONTROL PANEL".
2. Click "NETWORK AND DIAL-UP CONNECTIONS" (or "NETWORK CONNECTIONS")
3. Right-click on the "LOCAL AREA CONNECTION" icon and choose "PROPERTIES"
4. Under the name of your LAN card, click the "CONFIGURE" button
5. Choose the "ADVANCED" tab
6. On the left column, you should choose "Media Type" or "Connection Type" or "Line Speed", and then change the value to "10 BaseT" or "10 Mpbs Half-dulplex"
7. Click "OK" to confirm changes

F. Install WindowsXP Service Pack 1 and re-install LAN card driver

The networking component of your Windows or your LAN card driver may have been corrupted. You can install WindowsXP service pack 1 from the Microsoft website, and the latest LAN card driver from your manufacturer's website.

You can also view our knowledge base for more details
https://helpdesk.itsc.cuhk.edu.hk/kms/kblistentryAction?entryID=0000000085

Error 809

Please make a notice on the Norton Internet Security installed on Windows Vista, which can cause error 809. Even if you have never install Norton Internet Security, there should be a Norton Internet Security Free Trial provided by Windows Vista. It is known to interfere with CUHK's VPN connection. Even if you have no Norton firewall, but have the installation of Free version of Norton Internet Security, the error will still prompt out. You are advised to uninstall Norton Internet Security and have a _minimal installation_ of Trend Micro Internet Security (that is, install ONLY the anti-virus software component but NOT the firewall component), then turn on the Windows firewall.

The following is the solution of uninstall Norton internet security:
In order to uninstall the Norton program, I suggest you to download and run the Norton Removal Tool to remove the previous version of the Norton program from your computer.

NOTE: Norton removal utility is removal tool which removes all versions of Symantec products completely from your system.

For detailed instructions on uninstalling the Norton program using the Norton removal tool, please visit the following link and follow the steps provided in it.

Title: 'Download and run the Norton Removal Tool'
Document ID: 2005033108162039
Web URL:
http://service1.symantec.com/Support/tsgeninfo.nsf/docid/2005033108162039

In order to troubleshoot the VPN, please note that Norton AntiVirus includes a firewall that is called Internet Worm Protection (IWP). This feature protects the computer against unwanted attempts to connect to your computer.

In order to fix this issue, I suggest you to follow the document provided below:

Title: 'Cannot access your Virtual Private Network (VPN) after installing Norton Internet Security 2007'
Document ID: 2007032701294536
Web URL:
http://service1.symantec.com/Support/nip.nsf/docid/2007032701294536

Should you still have further problem concerning network usage within CUHK, please feel free to contact us at the electronic helpdesk or at our hot-line: 2609-8845.

Error Disabled (Email Template)

Submitted By YOUR_NAME
AR : AR_NUMBER
Hostel: HOSTEL_BUILDING, ROOM_NUMBER
Switch: SWITCH_NAME

Port Name Status Vlan Level Duplex Speed Type
----- ------------------ ---------- ---------- ------ ------ ----- ------------
2/21 RM:0112 0112A connected 260,901 normal a-full a-100 10/100BaseTX

Error Disabled Port

Your port had been disabled because our network equipment has received a lot of error packets generated from your computer. Now, your port is on the way of activation. You may try to connect to VPN after three working days. If you still fail to connect to VPN after a week, please feel free to contact us again.

Meanwhile, please check out the following suggestions carefully OR
you will face the same problem immediately after we re-enabled your port.

A. Network Bridge Enabled.

It happens mainly in Window XP. When the network bridge is used, your computer acts as a network bridging equipment, which sends out network protocol to communicate with the adjacent network equipment. However, these network protocols are not allowed to communicate with ResNet for security concerns. To disable the network bridge, please
1. Open "Network Connections"
2. Under Network Bridge, right-click "Network Bridge", and click "Disable"

B. Virus Infection

The delivery of a huge number of irregular message packets indicates that your computer may have been infected by computer virus. To avoid harming other users in the network, you should install the latest version of anti-virus software and scan your computer thoroughly. Please use the anti-virus software provided by CUHK and update the virus definitions daily. For details, please refer to http://avserver.itsc.cuhk.edu.hk/. Besides, please do not open or execute any files or e-mail from unknown source. If the problem still exists, we may consider to temporarily disable your computer from the connection.

C. Inappropriate Network Driver.

Please check if your network card driver matches your Windows version. We suggest you to update the driver at the manufacturer's website.

D. Faulty Cable.

Please check if your cable has been broken and replace it with a good one.

The reason for disabling your port is that our network equipment has received a lot of error packets generated from your computer. It takes extra processing time for the equipment to process these errors. In order to safeguard the security and the proper running of the network, the equipment therefore disables your network port automatically.

You can also view our knowledge base for more details
https://helpdesk.itsc.cuhk.edu.hk/kms/kblistentryAction?entryID=0000000002

Hard Coded IP Address

Please check if your have hard-coded an IP address onto your computer.
To ensure that you have not hard-coded your IP address,

( Windows 98 or Windows ME )
1. Click "START", then "SETTINGS" and go to "CONTROL PANEL";
2. Click "NETWORK";
3. Choose the "TCP/IP" settings of your LAN card ("TCP/IP -> [the model of your LAN card]), and click "PROPERTIES";
4. Under the tab "IP Address", choose "Obtain an IP address automatically" and "Obtain DNS server address automatically"
5. Click "OK" to reboot your computer;

( Windows 2000 or Windowns XP )
1. Click "START", then "SETTINGS" and go to "CONTROL PANEL";
2. Click "NETWORK AND DIAL-UP CONNECTIONS" (or "NETWORK CONNECTIONS");
3. Right-click on the "LOCAL AREA CONNECTION" icon and choose "PROPERTIES";
4. Choose "INTERNET PROTOCOL (TCP/IP)" and click "PROPERTIES";
5. Under the tab "General", Choose "Obtain an IP address automatically" and "Obtain DNS server address automatically"
6. Click "OK" to confirm changes;

(Windows Vista)
1. Click "Start" Menu, and go to "Network";
2. In "Network and Sharing Center", Click "Manage network connections"
3. Right-click on the "Wireless Network Connection" icon and choose "Properties";
4. Under the tab "Networking" , Choose "Internet Protocol (TCP/IP)" and click "Properties";
5. Under the tab "General", Choose "Obtain an IP address automatically" and "Obtain DNS server address automatically"
6. Click "OK" to confirm changes;

You can also view our knowledge base for more details
https://helpdesk.itsc.cuhk.edu.hk/kms/kblistentryAction?entryID=0000000483

If you still face the same problem after trying the suggestions, please feel free to contact us again, thank you.

Incompatibility between IPSec Client and ICS (Win98)

As the IPSec VPN client is not compatible with the Internet Connection Sharing (ICS) feature that is available with Windows 98 Second Edition (SE) and Windows Me. You must remove ICS before installing Microsoft L2TP/IPSec VPN client.

To remove Internet Connection Sharing (ICS), please follow these steps:
1. Click Start, point to Settings, and then click Control Panel.
2. Double-click Add/Remove Programs, and then click the Windows Setup tab.
3. Click Internet Tools, and then click Details.
4. Click to clear the ICS check box, and then click OK.
5. Restart the computer.

Please then try reinstall the Win98 VPN Client and follow the instruction on the ITSC webpage to finish the installation of the VPN setup.
Thanks for your attention.

Insufficient Information

We are glad to help you to solve your problem. From your information provided, we are still unable to spot out the cause of problem.
Please kindly help to provide the following additional information:

1. Your whole error message / error code prompted or encountered;
2. Click START and RUN, then type "command" ("cmd" for Win2000 / WinXP users),
(For Windows Vista users, hold down shift and right-click on desktop and you will get the option to "Open Command Window Here.")
type "ipconfig /all" and tell us the results;
3. Click START and RUN, then type "command" ("cmd" for Win2000 / WinXP users),
(For Windows Vista users, hold down shift and right-click on desktop and you will get the option to "Open Command Window Here.")
type "arp -a" and tell us the results;
4. Click START and RUN, then type "command" ("cmd" for Win2000 / WinXP users),
(For Windows Vista users, hold down shift and right-click on desktop and you will get the option to "Open Command Window Here.")
type "ping ipsec-vpn.resnet.cuhk.edu.hk" and tell us the results;
5. The EXACT time when the problem occurs;
6. The version of your windows (e.g., Win98 / WinMe or WinXP / Vista?) and the version of your windows service pack (e.g. WinXP SP2 / Win2000 SP4);
7. Your contact number for easy communication;
8. Your hostel address;
9. Your port number;
10. Are you using a notebook or a desktop computer?

The more information we have, more fast we can spot out the problem.
We are looking foward for your reply.

Mac with Unknown Version of OS

Mac OS can also access to CUHK VPN network. If you are using Mac OS 10.4 or above, you can just connect to resnet VPN with the VPN client provided by your computer.

If you are using a Mac OS of older version, please contact us with more details, e.g. your error messages, your configuration of the computer, etc. We can help you to solve your problem as soon as possible.

Reinstall LAN Card Driver

For your problem, we suggest you to re-install your lan card driver which may be the source of your problem.
Before you do so, please ensure that you have the correct version of your LAN card driver for installation purpose.

1. Click START, then SETTINGS and go to CONTROL PANEL;
2. Click SYSTEMS;
3. Click the HARDWARE tab; (For Win2000 / WinXP users, please click the DEVICE MANAGER button also);
4. Under the NETWORK ADAPTER, you should find your LAN card's model;
5. Right-click on the name of your LAN card, choose UNINSTALL;
6. Click OK and reboot your computer;
7. The system will then automatically search for your LAN card;
8. Follow the NEW HARDWARE INSTALLATION WIZARD as instructed to install your LAN card;

If you still face the same problem after trying the suggestions, please feel free to contact us again, thank you.

Reinstall VPN Client (WinME, Win98)

For your problem, we suggest you to re-install your VPN adapter which may be the source of your problem.
Before you do so, please ensure that you have the windows CD for installation purpose or you are using an internal windows version.

1. Click START, then SETTINGS and go to CONTROL PANEL;
2. Click ADD / REMOVE PROGRAMS;
3. Click the WINDWS SETUP tab;
4. Uncheck the COMMUNICATIONS option;
5. Reboot your computer as instructed;
6. Click START, then SETTINGS, go to CONTROL PANEL, go to ADD / REMOVE PROGRAMS, go to WINDOWS SETUP as before;
7. Select the COMMUNICATIONS option;
8. Click DETAILS button;
9. Check the DIAL-UP CONNECTIONS and the VIRTUAL PRIVATE NETWORKING options;
10. Click OK to reboot your computer again;
11. Try to connect again;

If you still face the same problem after trying the suggestions, please feel free to contact us again, thank you.

Release and Renew IP Address (WinME, Win98)

You may try to release and renew your IP address to see whether the problem could be fixed. The procedure of release and renew IP address is provided below:

To re-obtain a correct IP address (10.0.xxx.yyy),
1. Click the ""START"" menu and then select ""RUN..."".
2. Type the ""command"" command and press ""OK"".
3. A command prompt window will appear.
4. Type ""ipconfig /release_all"" and press ""ENTER"". Retry a few times if it fails to get a ""10.0.0.0"" IP Address.
5. If it still fails, unplug your LAN cable from the ResNet port and try again. (This step is very important)
6. Plug your LAN cable back to the ResNet port.
7. Type ""ipconfig /renew_all"" and press ""ENTER"". Retry until you obtain a ""10.0.0.0"" IP Address

Release and Renew IP Address (WinXP, Win2k)

You may try to release and renew your IP address to see whether the problem could be fixed. The procedure of release and renew IP address is provided below:

To re-obtain a correct IP address (10.0.xxx.yyy),
1. Click the ""START"" menu and then select ""RUN..."".
2. Type the ""cmd"" command and press ""OK"".
3. A command prompt window will appear.
4. Type ""ipconfig /release"" and press ""ENTER"". Retry a few times if it fails to get a ""10.0.0.0"" IP Address.
5. If it still fails, unplug your LAN cable from the ResNet port and try again. (This step is very important)
6. Plug your LAN cable back to the ResNet port.
7. Type ""ipconfig /renew"" and press ""ENTER"". Retry until you obtain a ""10.0.0.0"" IP Address

Then you may try to connect to VPN again, if your problem still exists, please feel free to contact us again, thank you.

Reset TCP/IP under WinXP

You cannot uninstall TCP/IP in Windows XP, because there is no Uninstall button for this protocol.
According to Microsoft, that is because TCP/IP is an integral part of the operating system,
and removing it would cause major problems.
You can, however, use the Windows XP command line utility NetShell to reset all IP-related Registry settings
to their default values. The result is a brand-new TCP/IP configuration.

The Netsh.exe program is located in the C:\Windows\System32 directory. To reset the TCP/IP configuration, enter the command:

Click START and RUN, then type "command" ("cmd" for Win2000 / WinXP users), type
netsh int ip reset vpn.log

If you still face the same problem after trying the suggestions, please feel free to contact us again, thank you.

Unstable Network Connection

The unstable network connection may caused by the following:
1. automatic timeout setting in Windows.
2. speed settings of your LAN card's configuration

A. Automatic timeout setting in Windows. You can try the following procedures to correct the situation:

(for Windows ME / 98 users)
1. Double click "Dial Up Networking" in "My Computer"
2. Right click on your VPN connection icon, left click on the "Properties" menu
3. Click "Configure" and select the "Connection" tab
4. Uncheck the item "Disconnect when idle for more than XX minutes"
5. Click the OK button to save the changes
6. On your desktop, right click "Internet Explorer", left click "Properties" menu
7. Click "Connection" tab and click "Settings"
8. Uncheck "Disconnect if idle for XX minutes"

(for Windows XP / 2000 users)
1. Open "Network and Dial-up Connections" in "Control Panel"
2. Right click your VPN connection icon, and choose "Properties"
3. Choose "Options" tab
4. Change "Disconnect when idle for xxxx" to "never"
5. Click "OK" and exit
6. Open "Internet Options" in "Control Panel" (WinXP users need to change to "classic view" before continuing)
7. Choose "Connections" tab
8. Select your VPN connection and click "Settings"
9. Click "Advanced" button
10. Uncheck "Idle xxxx minutes before disconnection"

B. It may be caused by the speed settings of your LAN card's configuration. Please set up the speed with "100 Mbps Full Duplex".

You can re-configure your LAN card's speed as follows:
1. Open "Network and dial-up connections" in "Control Panel"
2. Right click your LAN card's connection (usually stated as "Local Connection") and click
"Properties"
3. Make sure that you have selected the right connection of your LAN card, and click "configure"
button
4. In the "Advanced" tab, find "Connection Type / Media Type / etc", and change it to "100 Mbps Full Duplex"
5. Click "OK"

You can also view our knowledge base for more details
https://helpdesk.itsc.cuhk.edu.hk/kms/kblistentryAction?entryID=0000000056

If you still face the same problem after trying the suggestions, please feel free to contact us again, thank you.

With MAC Address 00-00-00-00-00-00

Our system cannot locate your LAN card and show a invalid hardware address. To solve this, please update or re-install your LAN card driver.

Also, please click "Start" => "Run" and type in "cmd" in the text box and press enter. Then the command prompt window appears. Then type in "ipconfig /all" and press enter. This information can help us to locate your problem

If the problem presist, please feel free to contact us and supply with the details of your error messages.

2008年8月19日星期二

Hildon Desktop

Hildon Desktop is the main UI component of the Maemo UI. It consists of two panels and the Home area. Each panel can house plugins and basically function like on an ordinary desktop environment except for that this user interface was designed for touch screen use on mind and was originally developed to Nokia 770 Internet tablet. Build-Depends: libhildon1-dev, libosso-dev, osso-af-settings, libhildonfm2-dev, libhildonhelp-dev Very closely tied with hildon-theme-plankton. .

Hildon - GNOME Live!

Hildon

Hildon application framework introduces a new desktop for handheld devices. It comprises a lightweight desktop, a set of widgets optimized for handheld devices, a set of theming tools and other complementary libraries and applications.

2008年8月17日星期日

美國作家剖析互聯網發達導致閱讀能力下降

以寫作一系列網路書籍而知名的《哈佛商業評論》前編輯尼古拉斯·卡爾日前在2008年7-8月號的《大西洋月刊》撰文，以《Google是否讓我們越變越傻》為題，痛苦地剖析自己和互聯網一代的大腦退化歷程。卡爾不是唯一一個遇到此種問題的人。他向朋友們傾訴，竟然得到許多共鳴：“我再也讀不了《戰爭與和平》了。我失去了這個本事。即便是一篇blog，哪怕超過了三四段，也難以下咽。我瞅一眼就跑。”

一些專家認為，互聯網改變的不僅是人類的閱讀方式，或許還有思維方式，甚至自我。

“過去幾年來，我老有一種不祥之感，覺得有什麼人，或什麼東西，一直在我腦袋裏鼓搗個不停，重繪我的‘腦電圖’，重寫我的‘腦記憶體’。”尼古拉斯·卡爾在《Google是否讓我們越變越傻》中寫道，“我的思想倒沒跑掉───到目前為止我還能這麼說，但它正在改變。我不再用過去的方式來思考了。”

他注意到，過去讀一本書或一篇長文章時，總是不費什麼勁兒，腦袋瓜子就專注地跟著其中的敘述或論點，轉個沒完。可如今這都不靈了。“現在，往往讀過了兩三頁，我的注意力就漂走了。我好煩，思緒斷了，開始找別的事兒幹。”他總想把心收回來，好好看會兒書，投入的閱讀以往是自然而然，如今則成了一場戰鬥。

思維呈現“碎讀”特性

卡爾找到了原因。過去這十多年來，他在網上花了好多時間，在互聯網的資訊汪洋中沖浪，搜尋。對作家而言，網路就像個天上掉下來的聚寶盆，過去要在書堆裏花上好幾天做的研究，現在幾分鐘就大功告成。Google幾下，動兩下滑鼠，一切就都有了。即便不工作的時候，他也很可能是在網路密林裏覓食：讀、寫電郵，瀏覽新聞標題和blog，看視頻節目，聽podcast，要麼就是一個鏈結一個鏈結地瞎轉悠。

“對我來說，”卡爾寫道，“對別人也是如此，網路正在變成一種萬有媒介，一種管道，經由它，資訊流過我的眼、耳，進入我的思想。”

資訊太豐富了，我們受用不盡，也不忘感恩戴德，卻往往忽視了要付出的代價。正如麥克盧漢40年前所說，媒體可不僅僅是被動的資訊渠道。它們提供思考的原料，但同時也在定義著思考的過程！“網路似乎粉碎了我專注與沉思的能力。現如今，我的腦袋就盼著以網路提供資訊的方式來獲取資訊：飛快的微粒運動。”卡爾說，“過去我是個深海潛水者，現在我好像踩著滑水板，從海面上飛馳而過。”

長期在密歇根醫學院任教的布魯斯·弗裏德曼（BruceFried－man），今年早些時候也在自己的blog上寫到互聯網如何改變了他的思維習慣。“現在我已幾乎完全喪失了閱讀稍長些文章的能力，不管是在網上，還是在紙上。”他在電話裏告訴卡爾，他的思維呈現出一種“碎讀”（staccato）特性，源自上網快速瀏覽多篇短文的習慣。

倫敦大學學院以五年時間，做了一個網路研讀習慣的研究。學者們以兩個學術網站為對象───它們均提供電子期刊、電子書及其他文字資訊的線上閱讀，分析它們的瀏覽紀錄，結果發現，讀者好像“一掠而過”，忙於一篇又一篇地瀏覽，且極少回看已經訪問過的文章。他們打開一篇文章或一本書，通常讀上一兩頁，便“蹦”到另一個地方去了。有時他們會把文章保存下來，但沒有證據顯示他們日後確曾回頭再讀。

報告說：“很明顯，用戶們不是在以傳統方式進行線上閱讀，相反，一種新‘閱讀’方式的跡象已經出現：用戶們在標題、內容頁和摘要之間進行著一視同仁的‘海量瀏覽’，以求快速得到結果。這幾乎可被視為：他們上網正是為了回避傳統意義上的閱讀。”

“電腦將成為我們的思想”

塔夫茨大學的心理學家、《普魯斯特與魷魚：閱讀思維的科學與故事》一書作者瑪雅妮·沃爾夫（MaryanneWolf）說：“我們並非只由閱讀的內容定義，我們也被我們閱讀的方式所定義。”她擔心，將“效率”和“直接”置於一切之上的新閱讀風格，或會減低我們進行深度閱讀的能力。幾百年前的印刷術，令閱讀長且複雜的作品成為家常之事，如今的互聯網技術莫非使它退回了又短又簡單的中世紀？沃爾夫說，上網閱讀時，我們充其量只是一台“資訊解碼器”，而我們專注地進行深度閱讀時所形成的那種理解文本的能力、那種豐富的精神聯想，在很大程度上都流失掉了。

沃爾夫認為，閱讀並非人類與生俱來的技巧，不像說話那樣融于我們的基因。我們得訓練自己的大腦，讓它學會如何將我們所看到的字符譯解成自己可以理解的語言。

卡爾引用神經學家的觀點，證明成年人的大腦仍然頗具可塑性，而歷史上機械鐘錶和地圖的發明，同樣說明瞭人類如何因此改變了對時間與空間的思維。互聯網正是今日的鐘錶與地圖。

網路的影響遠遠超出了電腦螢幕的界限。當人們的思維方式適應了互聯網媒體的大拼盤範式後，傳統媒體也會做出改變，以迎合讀者或觀眾的新願望。電視節目加入了滾動字幕和不斷跳出的小廣告，報刊則縮短其文章的長度，引入一小塊一小塊的摘要，在版面上堆砌各種易於瀏覽的零碎資訊。今年3月，《紐約時報》便決定將其第2和第3版改為內容精粹，以使忙碌的讀者可以快速“品嘗”新聞。

“沒有哪種溝通系統能像互聯網今日所為這樣，在我們的生活中發揮如此眾多的作用───或者對我們的思維模式產生了如此廣泛的影響。”卡爾寫道。Google首席執行官埃裏克·施密特說，該公司致力於將“一切系統化”。

Google還宣佈，其使命是“將全世界的資訊組織起來，使之隨處可得，並且有用”。通過開發“完美的搜索引擎”，讓它能夠“準確領會你的意圖，並精確地回饋給你所要的東西。”問題是，它會使我們越變越蠢嗎？

“我感覺得到。我感覺得到。”卡爾最後說，庫布裏克黑色預言的實質在於：當我們依賴電腦作為理解世界的媒介時，它就會成為我們自己的思想。（康慨編譯來源：《東方早報》）

2008年8月14日星期四

特許財務分析師 - 維基百科，自由的百科全書

特許金融分析師（Chartered Financial Analyst，又譯為特許財務分析師(過去台灣常使用)、特許財經分析師(香港使用)、註冊金融分析師等），簡稱CFA，是全球金融財經界最為推崇的金融投資專業資格。CFA特許狀是由CFA協會（CFA Institute）所授與，該單位是全世界上最著名的投資行業專業團體之一。

2008年8月11日星期一

Nightware in PetaByte age

小薑雜談：PB 的挑戰 - Engadget 癮科技

PB 時代的第一大挑戰是什麼？就是資料的過濾。就算人類已經有產生 PB 級資料量的能力，但事實是我們並沒有把這些資料全部有效地存取的技術。因此選擇哪些資料更有價值，就成為了很重要的課題。之前就有提過的大型強子碰撞器，事實上因為是在觀測為時非常短的現象，因此每秒大約要拍下十億張的照片，才能確保不漏掉什麼重要的事情。如果全部的資料都要保留的話，每秒鐘就必須儲存 10PB 左右的資料 -- 也就是說每秒鐘會塞滿 10,000 顆 1TB 容量的硬碟。這是一個靠現有技術絕對不可能辦到的事情，所以必須靠硬體和軟體的過濾，找出每秒大約 100 個值得關注的事。即使如此，一年仍將產生約 15PB 的資料，或 15,000 顆 1TB 的硬碟，藏在這些資料裡頭的，有黑洞、異次元、平行宇宙，還有兩三個諾貝爾獎吧？

第二個挑戰，是資料的分析。分析和過濾不一樣，過濾是試圖減少資料量，但分析卻是變出更多的資料來。一個例子是選舉結果的預測 -- 一個仔細想想並沒有意義，但無論候選人、選舉人還是媒體都樂此不疲的遊戲。美國在 2004 年時，候選人 Howard Dean 收集了 100GB 的資料來分析，當時被認為是一個很恐怖的大資料庫。今年的總統選舉，Catalist 公司收集了一個 15TB 的超大資料庫，詳細分析每個人的性別、婚姻、年齡、種族、收入等各種資料，並且從中獲得判斷一個人會投給共和黨還是民主黨的重要資訊。依照同樣的比例增加下去，下一次美國總統選舉時的資料量和分析結果肯定會達到數 PB 之譜，屆時對資料探勘、分析所需的運算資源的要求會非常可怕，或許非要用 Cloud Computing 的方式才能運算的地步。嘿嘿，或許到時候預測系統都比你自已清楚你會投給誰...

第三個挑戰，是資料的呈現。這是一個比較抽象的關念，舉個例子來說好了，目前的數位相機解析度都高達 10mp 或更多，但一般人用的螢幕就算是最常見的高檔螢幕解析度（1920x1200）事實上才 2.3mp 而已。那多的那些資料不就可惜了？Wikipedia 現在就有點這種感覺，很多很好的文章和內容因為不容易取得，很難發揮它應有的真正價值。

第四個挑戰，是資料的傳輸。之前在網路上看過一個很有趣的問題：將 1PB 的資料從美國西岸送到台灣，是用傳輸的快，還是用帆船把整個伺服器運過去快？一點簡單的數學告訴我們，要在合理的時間範圍內把資料傳完...就假設三個月好了。要在三個月內把 1PB 的資料傳完，傳輸送率要大約 1Gb/s 才行。這個數字不是特別的不可能（學術單位間常常有這麼大量資料來往），但絕對不是一般民眾能負擔得起的。以目前的技術來說，如果你要傳 1PB 的超高畫質*嗶*片給在美國的朋友的話，絕對是用海運的比較快...

最後，第五個挑戰，是資料的搜尋。拜 Google 大神所賜，這或許是我們最不須要要擔心的一環了。但 Google 的強大也僅限於公開的網路而已，自已電腦上的檔案要能分類清楚依然是很困難的一件事。Windows Vista 本來想要加入的 WinFS 檔案系統和隨之而來的關連式檔案架構似乎帶來了一線曙光，但最後我們還是被卡在樹狀結構的 NTFS 裡。當個人電腦資料量也到 1PB 的時候，嗯，真難想像到時候會是個怎麼樣的惡夢。

訂閱：文章 (Atom)

2008年9月6日 星期六

CUHK Resnet FAQ

2008年8月19日 星期二

Hildon Desktop

2008年8月17日 星期日

美國作家剖析互聯網發達導致閱讀能力下降

2008年8月14日 星期四

2008年8月11日 星期一

Nightware in PetaByte age

2008年9月6日星期六

2008年8月19日星期二

2008年8月17日星期日

2008年8月14日星期四

2008年8月11日星期一