Received error: ora-12638: Credential retrieval failed when trying to connect to spotlight on rac (4249895)

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Received error: ora-12638: Credential retrieval failed when trying to connect to spotlight on rac
Description

Received error: ora-12638: Credential retrieval failed when trying to connect to spotlight on rac
Resolution

If both client and server sqlnet.ora have SQLNET.AUTHENTICATION_SERVICES set to NTS, set it to none, and try to connect again.
i.e. SQLNET.AUTHENTICATION_SERVICES=NONE

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