@jamespark 

When you enable the Open VPN server you do not need to do any port forwarding. If you are noticing the port is not responding, look at the WAN IP (not LAN IP) address of the Archer C2300. If the IP address is a private address such as 192.x.x.x or 10.x.x.x or 172.x.x.x then the modem the C2300 is connected to in order to receive internet has a firewall so port fowarding would need to be done on that.

Thanks for your reply. I am getting connection timed out when trying to connect to Open VPN via port 1194. Since I noticed that, I tried Port Forwarding to my computer with port 22 for SSH just to see if it would work. I get connection timed out for this as well. After doing more testing, I tried Port Forwarding to my computer with port 80 and get connection refused, which was encouraging. When I delete port forwarding to 80, I get connection timed out for 80, which I would expect. It seems like enabling port forwarding for existing services gets me connection refused, but if I try a port not on the list, I just get connection timed out. It doesn't seem like the ports are opening for Open VPN or for Port Forwarding as one would expect. I may try an earlier firmware version to see if I can get port 1194 for Open VPN to work.