How to fix the Oracle error ORA-12624: TNS:connection is already registered?

In this post, you’ll learn more about the Oracle ErrorORA-12624: TNS:connection is already registered with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-12624: TNS:connection is already registered

Reason for the Error ORA-12624: TNS:connection is already registered

An attempt to register a connection for event notification failed because the connection is already registered.

How to fix the Error ORA-12624: TNS:connection is already registered ?

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

Not normally visible to the user. For further details, turn on tracing and reexecute the operation and contact Oracle Customer Support.