task and port number?

["Scott R. Ehrlich" <user=81@nabble.blu.org>]

 On a Linux system, if a program claims that a port is in use (say I want 
to install a web server on port 80, but the web server claims port 80 is 
already in use, and a ps auwx doesn't show/claim a web server is running), 
is there a program that can tell me what application is using the port? 

Yes, nmap will show ports, but the apps it shows are part of its own 
built-in database or /etc/services, so the app report isn't accurate. 

netstat -a will show apps and their PIDs, then later what ports are open, 
but no direct port <-> app mapping. 

Maybe there is a compilation of ssh server designed to listen on port 
65530, and the daemon name is something I wouldn't expect, or it is 
invoked by some other application. 

What tool can I use for real-time port <-> app mapping? 

Thanks. 

Scott 

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