Fix Linux VPN Connection Failure

My VPN will not connect at all on my Linux computer. Credentials are correct, but every attempt stalls before the tunnel is established. I’m working from the standard NetworkManager GUI and, under the hood, OpenVPN is the current protocol; WireGuard is also available if it proves easier to debug.

I’d like you to isolate the root cause (logs, routing tables, iptables rules, DNS, MTU—whatever it turns out to be), apply the necessary fixes, and leave the system in a state where the VPN connects reliably and survives a reboot.

Deliverables
• A stable, working VPN connection on this Linux machine
• A concise write-up of what went wrong and the exact commands or configuration changes you applied

I will confirm completion by reconnecting after a reboot and running basic ping and throughput tests through the tunnel.