NNO-00263
error from configuration database
Cause
the server encountered an error while accessing the configuration database. The error can occur when the database is unavailable, or SQL*Net connectivity to the database is interrupted.
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.