Hello OpenVPN Community,
we faced the same issues after updating to Version 3.4.
The most problems we are facing are connected to Sophos UTM Appliances.
In the OpenVPN Logs:
[Jul 14, 2023, 08:28:29] NOTE: This configuration contains options that were not used:
⏎[Jul 14, 2023, 08:28:29] Unsupported option (ignored)
⏎[Jul 14, 2023, 08:28:29] 0 [ip-win32] [dynamic]
⏎[Jul 14, 2023, 08:28:29] 7 [resolv-retry] [infinite]
⏎[Jul 14, 2023, 08:28:29] 9 [persist-key]
⏎[Jul 14, 2023, 08:28:29] 10 [persist-tun]
⏎[Jul 14, 2023, 08:28:29] UNKNOWN/UNSUPPORTED OPTIONS
⏎[Jul 14, 2023, 08:28:29] 15 [route-delay] [4]
After editing the .ovpn config and deleting the entry for "route-delay 4", the configs started to function again.
After some research it seems to be an automatic config from the sophos UTM ovpn template itself, that can be changed via ssh.
The problem is, that after every update on the appliance, the config needs to be changed manually again.
Here is a community thread regarding this topic:
https://community.sophos.com/utm-firewall/f/vpn-site-to-site-and-remote-access/55378/adjusting-the-openvpn-configuration-template-overwritten-with-by-updates
Hope this helps somebody.
Kind Regards
PS