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Oracle Troubleshooting


ORA-12516: TNS:listener could not find available handler with matching protocol stack


Symptom:

The error:

ORA-12516: TNS:listener could not find available handler with matching protocol stack

Causes:

None of the known and available service handlers for the given SERVICE_NAME support the client's protocol stack: transport, session, and presentation protocols.

Remedy:

Check to make sure that the service handlers (e.g. dispatchers) for the given SERVICE_NAME are registered with the listener, are accepting connections, and that they are properly configured to support the desired protocols.

Contributed by: Preetham SP.


This page represents one page of many pages of notes I made whilst working with Oracle 7 through to 10i. I now no longer work with Oracle databases, but hope that these notes will continue to be of benefit to others.



About the author: is a dedicated software developer and webmaster. For his day job he develops websites and desktop applications as well as providing IT services. He moonlights as a technical author and consultant.