Let's say the following is in the HPEL or SystemOut log. This error occurs when attempting to start a WebSphere application server. In this example, port 12345 is "already in use".

WSVR0009E: Error occurred during startup
com.ibm.ws.exception.RuntimeError: org.omg.CORBA.INTERNAL: 

ORBX0390E: Cannot create listener thread. Exception=[ java.net.BindException: Address already in use (Bind failed) - received while attempting to open server socket on port 12345 ].

WSVR0009E: Error occurred during startup 
com.ibm.ws.exception.RuntimeError: org.omg.CORBA.INTERNAL: CREATE_LISTENER_FAILED_4  vmcid: 0x49421000  minor code: 56  completed: No

Use the netstat command with the -p flag to determine the PID/Program name that is using the port in question. In this example, PID "1012" is using port 12345. If a dash is displayed in the PID/Program name column, you may need to restart the operating system.

netstat -p

Proto  Recv-Q  Send-Q  Local Address        Foreign Address   PID/Program name
tcp    0       0       102.168.0.101:12345  0.0.0.0:*         1012

Use the ps command with the -ef flags to determine the program associated wtih the PID that is using the port.

ps -ef | grep 98765

PID    TTY      TIME      CMD
98765    ?      00:00:00  /path/to/some/command

If the program using the PID is not needed, use the kill command with the -9 flag.

kill -9 98765

Attempt to start the WebSphere application server.