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

In this post, you’ll learn more about the Oracle ErrorORA-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

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

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

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

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

Check to make sure that the HANDLER_NAME specified is correct.