Originally posted here by n01100110
Well there is cisco IOS, which is Inter-networking Operating Software which is a little OS that the router uses for configurations etc, Im still taking cisco so i don't have it mastered..
But as for GFI, that program has been known for false positives..It caused me alot of head aches when I was scanning my systems, but they were just misinterpreted services, that sort of thing..

A lot of times when you do a portscan of a router, it has difficulty guessing the remote Operating system. When this happens, it tends to tell you that it is some sort of a Unix/Linux system. As for the webserver part, you might have an option turned on that lets you access your routers config over the internet which would maybe show up on a portscan as having a webserver running. For example, with my Linksys router I can turn on or off the option to access my router over the internet.