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NNO-00069:

warning: too many administrative region check failures, checking disabled
Cause: a warning issued whenever the server has continuously failed for three days in its attempts to connect to the configuration database. The server disables reload checking. Reload checking can later be re-enabled from the Oracle Network Manager or the Oracle Names control program.
Action: 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. To force the server to start up anyway, using its checkpoint data, start the server with the names.no_region_database parameter set to TRUE. If no checkpoint data is available, the server will shut down.