Oracle® Database 8i | 9i | 10g | 11g | 12c | 18c | 19c Error Codes
Information for Database Error Code ORA-12561: TNS:unknown error
ORA-12561: TNS:unknown error
Cause: A generic protocol error occurred.
Action: For further details, turn on tracing and reexecute the operation.
Error Type: ORA
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