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nmap reports open port 25/110 on Cisco devices

When I run an nmap conncect scan against my routers, firewalls and VPN concentrators it reports ports 25 and 110 as open.

nmap -sT -P0 <ip address>

The wierd thing is when I try to telnet to the devices with:

telnet <ip address> 25

or

telnet <ip address> 110

the screen goes blank like a connection is made. Eventually the connection will drop and I will be back at the DOS prompt.

On the routers I have access lists configured on the vty's to only allow traffic from a select group of hosts. The machine I am testing from is not include in the access-list. The access-list does work, because the test machine can not open a regular telnet connection (on port 23) to the router. However, it looks like it can open a connection to 25 & 110.

I searched the forums and saw that several other people experienced the same issue, however the questions were never answered.

Has anyone else experienced this? Any idea what would cause it?

Thank

1 REPLY
New Member

Re: nmap reports open port 25/110 on Cisco devices

hi,

have u tried to restart ur router?

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