Hi Kishor,
Echoing Siddhesh, do verify your listerner.ora & tnsnames.ora files for the hostname and see if your using any virtual name or physical hostnames.
also Do verify if your having any local_listener parameter in your spfile. if yes, the do confirm us if your using local listerner or a SID specific one. You can get this details by Listner name.
and check for the process listner and which ports its referring too.
Let us know the outcome/checks.
Regards,
Ram
