Netopia 3347 port forwarding problem

I can't seem to get port forwarding to work on my router. I have a network camera I want to be able to access via the internet. I opened a pinhole and used port 5080 (which is what I always used with the Cisco routers) but I can't seem to get it to work. I set external start and end to 5080 and internal port to 5080 (tried 80 too) but nothing seems to forward to it. I appreciate any help!