To check whether port is used on the server and who is using it currently
I am checking for the port 3872
$ netstat -an |grep 3872
tcp 0 0 :::3872 :::* LISTEN
To check who is using this port on a Linux Server
$ /usr/sbin/lsof -i :3872
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 5426 oracle 65u IPv6 25327 0t0 TCP *:oem-agent (LISTEN)
Currently this port is used by the Oracle user for the OEM-Agent.
I got this error message while trying to deploy the Oracle agent12c from the OEM12c
Failed SEVERE: Agent free port check failed
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