Messages

I had the same kind of issue after upgrade in version 21.1.3
I guess this is due to https hardening.

I rolled back to my last snaptop and define by default the https certificate generated by Opnsense.
You can also try to activate temporary the http mode, regenerate your certificates.

Cheers

I think you don't have to link the client cert to the user.
You can specify it on the client configuration.

(I'm using OpenVPN with external auth too).

W