OpenVPN Peer Certificate Verification Failure

[reda84]

Trying to connect to my OpenVPN instance consistently gives me a "peer certificate verification failure" error

In OPNsense I get these error messages:
2026-05-28T17:30:01 Error openvpn_server1 192.168.10.33:57357 TLS Error: TLS handshake failed
2026-05-28T17:30:01 Error openvpn_server1 192.168.10.33:57357 TLS Error: TLS object -> incoming plaintext read error
2026-05-28T17:30:01 Error openvpn_server1 192.168.10.33:57357 TLS_ERROR: BIO read tls_read_plaintext error
2026-05-28T17:30:01 Error openvpn_server1 192.168.10.33:57357 OpenSSL: error:0A000413:SSL routines::sslv3 alert unsupported certificate:SSL alert number 43

I have my OpenVPN instance set to not verify remote certificate or client certificate so I don't know why it would throw an unsupported certificate error

Here's my client export file without the certificates:
dev tun
persist-tun
persist-key
client
resolv-retry infinite
remote 192.168.10.254 1194 udp
lport 0
auth-user-pass