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NNC-00430:

Database not accessible
Cause: When a database is used for consistency between different nameservers, any modify operation should not only modify the cache but also the database. And if the database is not accessible, this error occurs.
Action: Not normally visible to the user, except when using the name server control program. If the error occurs when using the control program, make sure database is available and then re-execute the operation. If error persists, contact Worldwide Customer Support.