Filtered ports on new 2900 router

Answered Question
Jun 10th, 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):

scan.JPG

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

I have this problem too.
0 votes
Correct Answer by tprendergast about 6 years 6 months ago

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

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Correct Answer
tprendergast Thu, 06/10/2010 - 13:09

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

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