ORA-12523: TNS:listener could not find instance appropriate for the client connection
Cause: The listener could not find any available (database) instances, that are appropriate for the client connection.
Action: Run "lsnrctl services" to ensure that the instance(s) are registered with the listener, and have status READY.
ORA-12526
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ORA-12523TNS:listener could not find instance appropriate for the client connection