NNO-00307: invalid server name "string"

Answer Posted / guest

Cause: the server's name is invalid. 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.

Please add more information about this Error

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