ORA-12516 TNS:listener could not find available handler with matching protocol stack
This is an Oracle Database Server Message. This can be generated by the Oracle Database when running any Oracle program.
What is the cause of ORA-12516 from Oracle 10g ?
None of the known and available service handlers for the given SERVICE_NAME support the client's protocol stack: transport, session, and presentation protocols.
How to deal with ORA-12516 from Oracle 10g ?
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.
Contacting Oracle support services ?
Some messages recommend contacting Oracle Support Services to report a problem. Please go here for more information : Oracle Support.
Linked Error Messages
- ORA-12508 TNS:listener could not resolve the COMMAND given
- ORA-12509 TNS:listener failed to redirect client to service handler
- ORA-12510 TNS:database temporarily lacks resources to handle the request
- ORA-12511 TNS:service handler found but it is not accepting connections
- ORA-12513 TNS:service handler found but it has registered for a different protocol
- ORA-12514 TNS:listener does not currently know of service requested in connect descriptor
- ORA-12515 TNS:listener could not find a handler for this presentation
- ORA-12518 TNS:listener could not hand off client connection
- ORA-12519 TNS:no appropriate service handler found
- ORA-12520 TNS:listener could not find available handler for requested type of server
- ORA-12521 TNS:listener does not currently know of instance requested in connect descriptor
- ORA-12522 TNS:listener could not find available instance with given INSTANCE_ROLE
- ORA-12523 TNS:listener could not find instance appropriate for the client connection
- ORA-12524 TNS:listener could not resolve HANDLER_NAME given in connect descriptor