Solved: Filtered ports on new 2900 router

Kevin Melton · ‎06-10-2010

Yesterday we installed a new Cisco 2911 router running IOS Version 15.0(1)M1. After installation, I ran a scan against the router on its exposed side and found the following (scan conducted using nmap):

It is the filtered ports that I am concerned about. We see ports 135, 139, 445, and 1720 open. I am not sure why these even show up.

I would like to be able to run my scan, and not have the scanner pick up these ports at all. Is there something I can disable on the router that will prevent these ports from showing up?

Thanks

Kevin

tprendergast · ‎06-10-2010

There is actually nothing listening on those ports, the scanner just thinks they are filtered. It's a false-positive from nmap.

View solution in original post

tprendergast · ‎06-10-2010

There is actually nothing listening on those ports, the scanner just thinks they are filtered. It's a false-positive from nmap.