New computers not taking Azure VPN

Timothy Vanemden 1

My company just recently bought new computers for several of our remote employees. I was able to add them to the Endpoint Manager and they appear. I installed a troubleshooting VPN and I'm able to connect using that, however it does not allow for server access. My problem is that once the computers are added to the Endpoint Manager they have an auto connect VPN installed automatically, this allows for server access. Unfortunately I keep getting "Connection failed with error 0x259E9 => IKE Authentication credentials are unacceptable."

This the is the same script for the VPN and the same username/PW configuration as was used on previous computers and I'm not sure where to look for answers. Has anyone else had any thing like this? How did you resolve it?

Miguel Gonçalves | AVANADE 886 Reputation points

2024-06-11T14:45:42.05+00:00
Hi Timothy,

The error message “Connection failed with error 0x259E9 => IKE Authentication credentials are unacceptable” indicates a problem with the IKE (Internet Key Exchange) authentication.

I suggest that you start with this most obvious ones;

Verify that the VPN configuration on the new computers matches the one used on the previous machines. Ensure that the script, username, and password are correctly configured. Double-check any certificate settings or additional authentication methods (if applicable).

IKE authentication involves negotiating security parameters during the VPN connection setup. Make sure the authentication credentials (such as pre-shared keys or certificates) are correct. If you’re using pre-shared keys, ensure they match the server-side configuration.

Check the Event Viewer logs on the client computers for any relevant error messages related to VPN connections. Look for events related to IKE negotiation failures.

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New computers not taking Azure VPN