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

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

TNS-12624: TNS:connection is already registered

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

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

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

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

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