pfSense

two years has passed.. any chances to have that fixed in near future?

Facing the same issue.
Currently we have 2 entries for 'Backend for authentication' selected (Active Directory domain controllers).
Whenever the first one goes down, OpenVPN connections get lost, new connections do not work.

Here's a snippet from the logs for one login attempt:

Jun 21 08:08:21 openvpn 21624 109.44.3.38:33876 TLS Error: TLS handshake failed
Jun 21 08:08:21 openvpn 21624 109.44.3.38:33876 TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
Jun 21 08:07:47 openvpn 21624 109.44.3.38:33876 TLS Error: incoming packet authentication failed from [AF_INET]109.44.3.38:33876
Jun 21 08:07:47 openvpn 21624 109.44.3.38:33876 Authenticate/Decrypt packet error: bad packet ID (may be a replay): [ #7 / time = (1466489247) Tue Jun 21 08:07:27 2016 ] -- see the man page entry for --no-replay and --replay-window for more info or silence this warning with --mute-replay-warnings
Jun 21 08:07:47 openvpn 21624 109.44.3.38:33876 TLS Error: incoming packet authentication failed from [AF_INET]109.44.3.38:33876
Jun 21 08:07:47 openvpn 21624 109.44.3.38:33876 Authenticate/Decrypt packet error: bad packet ID (may be a replay): [ #7 / time = (1466489247) Tue Jun 21 08:07:27 2016 ] -- see the man page entry for --no-replay and --replay-window for more info or silence this warning with --mute-replay-warnings
Jun 21 08:07:47 openvpn 21624 109.44.3.38:33876 TLS Error: incoming packet authentication failed from [AF_INET]109.44.3.38:33876
Jun 21 08:07:47 openvpn 21624 109.44.3.38:33876 Authenticate/Decrypt packet error: bad packet ID (may be a replay): [ #7 / time = (1466489247) Tue Jun 21 08:07:27 2016 ] -- see the man page entry for --no-replay and --replay-window for more info or silence this warning with --mute-replay-warnings
Jun 21 08:07:47 openvpn 21624 109.44.3.38:33876 TLS Error: incoming packet authentication failed from [AF_INET]109.44.3.38:33876
Jun 21 08:07:47 openvpn 21624 109.44.3.38:33876 Authenticate/Decrypt packet error: bad packet ID (may be a replay): [ #7 / time = (1466489247) Tue Jun 21 08:07:27 2016 ] -- see the man page entry for --no-replay and --replay-window for more info or silence this warning with --mute-replay-warnings
Jun 21 08:07:47 openvpn 21624 109.44.3.38:33876 TLS Error: incoming packet authentication failed from [AF_INET]109.44.3.38:33876
Jun 21 08:07:47 openvpn 21624 109.44.3.38:33876 Authenticate/Decrypt packet error: bad packet ID (may be a replay): [ #7 / time = (1466489247) Tue Jun 21 08:07:27 2016 ] -- see the man page entry for --no-replay and --replay-window for more info or silence this warning with --mute-replay-warnings
Jun 21 08:07:47 openvpn user 'svenl' authenticated
Jun 21 08:07:47 openvpn /openvpn.auth-user.php: ERROR! Could not bind to server w2003svr1.