In this post, you’ll learn more about the Oracle ErrorORA-12638: Credential retrieval failed with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-12638: Credential retrieval failed
Reason for the Error ORA-12638: Credential retrieval failed
The authentication service failed to retrieve the credentials of a user.
How to fix the Error ORA-12638: Credential retrieval failed ?
You can fix this error in Oracle by following the below steps
Enable tracing to determine the exact error.