Answer / guest

Cause: The protocol adapter requested (by way of the
"(PROTOCOL=..)" keyword-value pair in a TNS address) is
unknown. If the supplied address is typographically correct
then the protocol adapter is not installed.

Action: Install the protocol adapter or correct
typographically error, as appropriate. Note: if the supplied
address was derived from resolving the service name, check
the address in the appropriate file (TNSNAMES.ORA,
LISTENER.ORA or SQLNET.ORA).

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