I'm setting OpenVPN for the first time [on a derivative of pfSense OPNSense]
I see in my OpenVPN logs the message:
"... TLS Error: TLS key negotiation failed ..."
Research has showed me that this is the most common error encountered by new implementers of OpenVPN. The error apparently stems from incorrect configuration of the firewall rules. I've been trying to troubleshoot these without much success. What (as a novice) I've noticed is that I've not found a comprehensive trouble shooting procedure which one can follow.
Would appreciate any points to such a troubleshooting resource.