All Oracle Error CodesOracle DBA Forum

NNO-00068:

warning: administrative region check failed, next check in number seconds
Cause: this warning is issued whenever the server fails to connect to the configuration database to see if any configuration data has changed. The server will automatically begin reissuing reload checks more frequently, and will eventually give up if connections fail continuously for three days.
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.