How to fix the Oracle error ORA-12511: TNS:service handler found but it is not accepting connections?

In this post, you’ll learn more about the Oracle ErrorORA-12511: TNS:service handler found but it is not accepting connections with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-12511: TNS:service handler found but it is not accepting connections

Reason for the Error ORA-12511: TNS:service handler found but it is not accepting connections

The dispatchers notified the listener that they temporarily do not accept new connections.

How to fix the Error ORA-12511: TNS:service handler found but it is not accepting connections ?

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

Attempt the connection again. If error persists, contact the DBA to check the state of the dispatchers and/or ask him to increase the number of dispatchers.