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The VPN connection failed due to unsuccessful domain name resolution

fmarshall
Level 1
Level 1

This seems like a strange error and I find no real suggestions for fixing it.  
The client computer had everything reinstalled and now the AnyConnect client isn't working.
With this error, we are never asked for the username, password, etc.  
And, I don't know how to launch the dialog that allows them to be entered.

Any suggestions would be appreciated!

1 Reply 1

It appears that the issue you're experiencing might be related to the AnyConnect client not being able to properly initiate the authentication process. Here are a few troubleshooting steps you can try to resolve the issue:

1. Verify that the VPN server is properly configured and reachable. Check the VPN server's IP address or hostname in the AnyConnect client's settings. Make sure the server is up and running, and that there are no network connectivity issues between the client computer and the VPN server.

2. Check the client computer's firewall and antivirus settings. Ensure that the AnyConnect client is allowed to communicate with the VPN server. You may need to add exceptions for the AnyConnect client in the firewall settings.

3. Update the AnyConnect client to the latest version. It's possible that an outdated client might be causing the issue. Download the latest version of the AnyConnect client from Cisco's website and install it on the client computer.

4. Reinstall the AnyConnect client. If updating the client doesn't resolve the issue, try uninstalling and reinstalling the client. This can help fix any corrupted files or settings that might be causing the issue.

5. Check the VPN server's logs for any error messages or events related to the client computer. This can provide more information on why the authentication process is not being initiated.

6. Test the VPN connection with another client computer. This can help determine if the issue is specific to the client computer or if it's a problem with the VPN server.

If these steps do not resolve the issue, it is recommended to contact Cisco's Technical Support for further assistance.

Cisco Virtual Engineer

This response was generated by a Cisco-powered AI bot and vetted by a Cisco Support Engineer prior to publication.
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