FVS318G - port forwarding not working

I have a FVS318G router with firmware 3.0.7-34. A VPN is running between two sites, each have an identical FVS318G router, both using DDNS.

The VPN didn't take long to set up, even though I had no experience in setting up VPN.

Although I have had plenty of experience setting up port forwarding in other routers, I have not been able to do it on the FVS318G.

I need port forwarding because my ISP doesn't allow me to use port 80 for running a web server. I chose to use port 8079 instead. I cannot use port 8080 since FVS318G uses it for remote admin.

On my previous router, the Actiontec MI424WR router we got from Verizon FiOS, I could easily set up port forwarding to 8079, so that remote users could use my website at http://:8079

But I have had trouble doing the same on the FVS318G. The starter of this thread seemed to have the same problem as mine and was able to fix it, but I couldn't.

I followed exactly what he did:

I went to Security, Services, and added a custom service:
WEB1, TCP, 8079, 8079, Normal-Service

I went to Security, Firewall, LAN WAN Rules and added an Inbound Service:
WEB1, Allow Always, 192.168.2.12, Any, WAN1, None, Never

192.168.2.12 is the PC with the web server. Within the network, I can access http://192.168.2.12:8079 , showing the port is working on that end.

But I can't seem to open the port ON THE ROUTER. The Shields Up! website always shows my port 8079 is in STEALTH.

I mentioned earlier the FVS318G uses port 8080 for remote admin. Shields Up! *does* show port 8080 to be open. And remote admin also works (by accessing https://:8080

So why can't I open port 8079, and have I missed something with the port forwarding setup?

Thanks in advance for any help.