How to fix the Oracle error TNS-12524: TNS:listener could not resolve HANDLER_NAME given in connect descriptor?

In this post, you’ll learn more about the Oracle ErrorTNS-12524: TNS:listener could not resolve HANDLER_NAME given in connect descriptor with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12524: TNS:listener could not resolve HANDLER_NAME given in connect descriptor

Reason for the Error TNS-12524: TNS:listener could not resolve HANDLER_NAME given in connect descriptor

Cause: The HANDLER_NAME in the CONNECT_DATA was not found in the listener’s tables for the specified SERVICE_NAME and INSTANCE_NAME.

How to fix the Error TNS-12524: TNS:listener could not resolve HANDLER_NAME given in connect descriptor ?

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

Action: Check to make sure that the HANDLER_NAME specified is correct.