I have a Balance 30 as my gateway router and I have setup an OpenVPN server on the LAN side of the router. I can successfully connect via VPN to the OpenVPN server from a workstation on the LAN, so the server’s firewall does not seem to be a problem. Also, I am using the Peplink VLAN features on this network to segment LANs, but still no problem connecting to the VPN server from a different VLAN.
When I try to connect to the OpenVPN server from the WAN through the Peplink, it fails. I have tried both NAT mapping and port forwarding (TCP:443, TCP:993, and UDP:1194), but still no success either on the TCP or UDP ports.
When I scan the ports from the WAN side using nmap on an outside server, it shows the ports as filtered, meaning the Peplink is blocking the ports. When port forwarding, I have even tried it with the OpenVPN server’s firewall off, and still not luck connecting from the WAN side.
Interestingly enough, the port forwarding does work from the WAN side when I access the OpenVPN server’s HTTPS web page using TCP:443 and a web browser.
While I happen in this case to be using OpenVPN, it shouldn’t matter, and the NAT mapping or port forwarding should be working.
I would appreciate any help or suggestions.