ORA-06616: LU6.2 Driver: Attach to LU failed Cause: The SQL*Net LU6.2 driver ...

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ORA-06616: LU6.2 Driver:Attach to LU failed
Cause: The SQL*Net LU6.2 driver was unable to attach to theLU specified in the
connect string, or was unable to attach to the default LU.
Action: Checkthat the LU name specified in the connect string, or the default LU
name if no LU was specified, is correctly configured and operational.