How to fix the Oracle error TNS-01102: TNS application contacted was not the listener?

In this post, you’ll learn more about the Oracle ErrorTNS-01102: TNS application contacted was not the listener with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-01102: TNS application contacted was not the listener

Reason for the Error TNS-01102: TNS application contacted was not the listener

Cause: Another TNS application such as the Interchange was listening at the address contacted. There may be another TNS application listening at the address contacted and the data returned is not in the appropriate format.

How to fix the Error TNS-01102: TNS application contacted was not the listener ?

You can fix this error in Oracle by following the below steps

Action: Verify that the listener name or service name specified to LSNRCTL has the correct name and address defined in LISTENER.ORA or in TNSNAMES.ORA.