Problems connecting via VPN

Last modified by Martin Výlet on 03.08.2023 13:57

If VPN concentrator after connection does not require login and password, please check your connection to VPN concentrator by using command:

  • From internet: ping

    (Enter ping command similary like here.)
    If server do not respond there is very likely problem with your network connection. Ask your provider for help.

VPN concentrators have no capacity limits.

If login and password is requied again and again, you are probably entering bad login or password. You may check if your password is not blocked here.

Also check if your access was not blocked due sharing (check your academic email).

Often there are problems with firewall settings or antivirus malfunction. Try deactivate them temporarily and connect again.

If you are connected to internet via SOHO router, problem might be there. Try to update firmware to the lastest version. We also register this problem at some TP-Link routers.

If you have a problem connecting through the AnyConnect client, make sure that you do not have activated a proxy server (Various anonymization services, etc.).

When you are installing the AnyConnect client and you will get the error message "Web-based installation was unsuccessful", perform the installation manually by clicking "Install using the link below".

When installing the AnyConnect client, an error occurs " The VPN client agent was unable to create the interprocess communication depot ", it is necessary to disable the service in the Windows Internet Connection Sharing / Internet Connection Sharing (for example

If you use Chrome / Chromium may appear instead of the page content following error:  Error 324 (net :: ERR_EMPTY_RESPONSE): Unknown error . The solution is to run the program with the following argument:   -  -disable-ssl-false-start . Argument can add the shortcut properties (icon Chrome / Chromium) in the Target box: ..  chrome.exe disable-ssl-false-start . More technical information can be found, for example,

Only for Cisco VPN client:

When logging will be correctly, but have problems when transferring data, set with utility setmtu   MTU 1300 B. Program in the directory with a VPN client "Program Files / Cisco Systems / VPN Client".

if your Internet service provider uses address translation, you must have setup a VPN client checked item   Enable Transparent Tunneling. Check this tab   Transport. You can use IPSec over UDP (preferred) and IPSec over TCP.

When using the Cisco VPN client is needed to the Windows  was not  installed  Transport Protocol compatible with NWLink IPX / SPX . Uninstall it in the Control Panel   Network Connections.

Occurs when you install the client on Windows Vista or Windows 7  error Internal Error 2738 or 1720 , follow these steps. Use this procedure even in the case when installed on Windows 7 64 bit error occurs  Installation ended prematurely Because of an error .
Only for Windows 7: 

  1. First you need to delete a registry key (there may be even twice):
    On Windows 7 64bit it is the key:
    More information

For Windows 7 and Vista:

  1. Make sure that you are not running the installer Cisco VPN client.
  2. Click on Start → All Programs → Accessories 
  3. Right-click on Command Prompt. Select Run As ... menu, then select Run As Administrator. 
  4. In the command prompt write cd C:\Windows\System32 and press enter. 
  5. Then enter regsvr32 C: \ Windows \ System32 \ vbscript.dll  and press Enter.
  6. You'll see a message that says "DllRegisterServer in C: \ Windows \ System32 \ vbscript.dll succeeded." Then click OK.
  7. Close the Command Prompt and restart the computer. 
  8. By now, the installation was done correctly.