Troubleshooting
Windows
“Potential CSRF attack detected” after logging into Shibboleth
If you receive this error message after logging into Shibboleth when establishing the VPN connection, please delete the corresponding website data and browser cache from your default web browser. Make sure that the browser is completely closed and then try again.
Error message before forwarding to Shibboleth: “Authentication failed due to a problem navigating to the single sign-on URL.”
You have not set a default browser. Select any browser in the app settings as your default browser to resolve the issue.
If the problem persists despite setting a default browser, please reset the default apps on your Windows computer. To do this, go to Windows Settings->Apps->Default Apps and scroll to the bottom of the list. Below this, you should have the option to reset the default apps. Perform this step, select a browser of your choice as the default app, and try to set up the VPN connection again. In our experience, restarting the computer is not necessary, but it does not hurt either.
Message “VPN server internal error” or “Internal error for the VPN server.”
If you receive this error message after logging into Shibboleth when establishing the VPN connection, please delete the corresponding website data and browser cache from your default web browser. Make sure that the browser is completely closed and then try again.
MacOS
Problems installing Cisco Secure Client when selecting the drive
- Open Terminal (Spotlight search (magnifying glass in the upper right corner of the menu bar) → Terminal)
- Enter the following command: sudo pkgutil --forget com.cisco.pkg.anyconnect.vpn
- You will then be asked for your local password (for administration on your Mac); for security reasons, the entry is invisible, so what you type is not displayed.
- Restart the installation. If necessary, shut down your Mac and restart it.
“Potential CSRF attack detected” after logging into Shibboleth
If you receive this error message after logging into Shibboleth when establishing the VPN connection, please delete the corresponding website data and browser cache from your default web browser. Make sure that the browser is completely closed and then try again.
Deleting the browser cache in Safari:
1. Go to the “Safari” menu and click on the “Advanced” option under Settings.
2. In this menu, select “Show Develop menu in menu bar.”
3. You can close the settings and click on the newly activated “Show Develop menu in menu bar” and select “Empty Cache”.
4. In the last step, quit Safari and restart the browser so that the settings can be adjusted.
5. You can deactivate the bar in the settings by removing the check mark.
Cisco Secure Client message: “VPN Server internal error” or “Internal error for the VPN server”
If you receive this error message after logging into Shibboleth when establishing the VPN connection, please delete the corresponding website data and browser cache from your default web browser. Make sure that the browser is completely closed and then try again.
Deleting the browser cache in Safari:
1. Go to the “Safari” menu and click on the “Advanced” option under Settings.
2. In this menu, select “Show Develop menu in menu bar.”
3. You can close the settings and click on the newly activated “Show Develop menu in menu bar” and select “Empty Cache”.
4. In the last step, quit Safari and restart the browser so that the settings can be adjusted.
5. You can deactivate the bar in the settings by removing the check mark.
Linux
“Potential CSRF attack detected” after logging into Shibboleth
If you receive this error message after logging into Shibboleth when establishing the VPN connection, please delete the corresponding website data and browser cache from your default web browser. Make sure that the browser is completely closed and then try again.
Message “VPN server internal error” or “Internal error for the VPN server.”
If you receive this error message after logging into Shibboleth when establishing the VPN connection, please delete the corresponding website data and browser cache from your default web browser. Make sure that the browser is completely closed and then try again.
Secure Client does not appear under Programs after installation
Update the package manager in the terminal using the command “sudo apt-update && sudo apt-upgrade” and restart the computer.
Input/Output Error Failed to execute default web browser
Depending on how browsers are installed, it may not be possible to configure them correctly as the default web browser. Check whether the browser has been installed as a Snap package and install it as a Debian package. You should now be able to change the default browser.
Android / chromeOS
“localhost:29786 Connection refused” is displayed in the browser
Disable desktop mode in your (default) web browser, close the browser, and try to reconnect.
If you are using the Chrome browser, please use an alternative (e.g., Firefox).
Contact
If you have any questions or problems, please contact the ITCC-Helpdesk