NNO-00320
missing server name parameter
Cause
the server could not find a names.server_name parameter. The name is specified in the server's names.ora configuration file.
Action
Make sure that the names.server_name parameter in names.ora is correct. The names.ora file is automatically generated by the Oracle Network Manager, but administrators can edit the file at any time, introducing errors. If the file was never changed, contact Worldwide Customer Support.