Penetration Testing: Port identification methodology

["Erik Norman" <erik.norman () ccnox com>]

Hi all,

I have a question regarding methodology while performing a 
PT. It concerns identifying programs/services.

Imagine a full nmap scan has been performed. A handfull 
of open ports was found on a particular server. The 
usual 25, 53, 80 etc are identified, but one or two ports 
stand out from the crowd. Looking in various 'common ports' 
files does not provide a hint what the port is used for.

Connecting with telnet yields no text, and a tcpdump 
dump does not provide any text (in clear anyway).


Now what!???

How should one approach this?


/Erik

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