NNO-00257: warning: cannot get serial number from region store

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NNO-00257: warning: cannot get serial number from region store..

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Cause: The server encountered an error while trying to get
the configuration database's serial number. The error occurs
almost always because time the server is unable to access
the configuration database. If the error occurs during
server startup, the server will shut down. If the error
occurs during server operation (the server checks the serial
number periodically to see if it should reload itself), then
the server assumes a transient failure has occurred and
repeats the operation a short while later. If the
repetitions continue to fail for three days, the server will
log another error and stop issuing the serial number load
operation.

Action: First make sure that the Netadmin program has
exported a server configuration for this name server. Next,
make sure that the database is running, that its name and
password as specified in the Oracle Network Manager are
accurate, and that there is SQL*Net connectivity between the
Oracle Names server and the database. If the error occurs
during server startup, you can force startup anyway, with
checkpoint data, by starting the server with the
names.no_region_database parameter set to TRUE. If no
checkpoint data is available, the server will shut down.

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