Oracle Errors Question:
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ORA-12515: TNS:listener could not find a handler for this presentation?

Answer:

Cause: None of the listener's known service handlers are
registered as supporting the presentation protocol required
by the connecting client.

Action: Check that the destination service is configured to
accept the presentation protocol.

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ORA-12516: TNS:listener could not find available handler with matching protocol stack?ORA-12514: TNS:listener does not currently know of service requested in connect descriptor?