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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