Oracle : Ошибка ORA-12198

"TNS:could not find path to destination"
*Cause: Could not navigate a path through Interchanges to the destination.
This error occurs if an invalid community is in the address string, or
the address includes a protocol that is not available or the
TNSNAV.ORA file does not have a correct CMANAGER address specified or
the Interchange is down.
*Action: Assure that Interchanges necessary to get to the desired
destination are up and have available capacity for an additional
connection. Also check that the correct community and protocol have been
specified in the CMANAGER address used.

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