I thought this might be of use to people with Netgear routers trying to forward port 80.
I have set up a testing server at my house and I recently bought this router, the WNDR3700, and I needed to forward ports 80, 443, and some others. Right off the bat, I ran into a problem. I got an error while trying to forward port *):
"The specified port(s) are being used by other configurations. Please check your configurations of USB Readyshare, Remote Management, Port forwarding, Port Triggering, UPnP Port Mapping table, RIP, and Internet connection type"
The thing is, it's obviously not on the forwarded services list, and so I called Netgear to find out what's using it. I first looked through everything (or so I thought) and couldn't find the answer. Netgear was no help either, and kept giving me the response that "Port 80 is being used by your internet connection and if you forward that, you won't be able to access the internet on other devices..."
Where's the "punch you in the face" smiley when you need it?
Anyway, I kept looking around, and discovered that, by default, USB Readyshare is using port 80 (like it said in the error). In order to disable this or to move it to another port, on the menu, go to:
USB Storage >> Advanced Settings
and either uncheck the HTTP Readyshare service for port 80 or change the port to something else, depending on whether you use that service.
I don't know why it was so hard to find, or why Netgear was being so stubborn, but this was the answer. FRUSTRATING.