I have a Watchguard firewall with SSL and L2TP VPN configured on it.
The SSL VPN authentication works perfectly well with DUO, but the L2TP VPN fails.
When I connect the L2TP VPN, I even get the push notification from DUO and Watchguard shows me the log that the authentication has been successful, but the VPN does not connect.
I showed the configuration to Watchguard and at the end, their support told me these exact words"The trouble you are experiencing with Duo MFA integrated with L2TP VPN, is a known issue with the vendor. There is nothing that can be done on the Firebox to make this configuration work, the configuration is not supported."
So What should we do now? Is something being done or anything in progress to solve this issue?