How to fix the Oracle error TNS-12519: TNS:no appropriate service handler found?

In this post, you’ll learn more about the Oracle ErrorTNS-12519: TNS:no appropriate service handler found with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12519: TNS:no appropriate service handler found

Reason for the Error TNS-12519: TNS:no appropriate service handler found

Cause: The listener could not find any available service handlers that are appropriate for the client connection.

How to fix the Error TNS-12519: TNS:no appropriate service handler found ?

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

Action: Run “lsnrctl services” to ensure that the instance(s) have registered with the listener, and are accepting connections.