ORA-12638: Unable to retrieve proof of identity resolution method

The NTS option makes the Oracle client attempt to use your current Windows domain credentials to authenticate Oracle server. This could fail for a couple of reasons: -The Oracle server is not a configured to support Windows authentication -The credentials to login to your local machine is not a sufficient to allow you to login to the server. In my case, it is the later. Despite the fact that I had told the client to use a different user name and password, it is still attempting to login us ing my domain credentials first. This failed because I is logged on to my local machine using my normal domain credentials rather than my administrator ac Count. Replacing the line: Sqlnet. Authentication_services= (NTS) With Sqlnet. Authentication_services= (NONE) In Sqlnet.ora resolved the issue is disabling local support for authenticating using Windows credentials. ORA-12638: How to resolve the failure of identity certificate retrieval Today, when using an application to connect to Oracle, a "ORA-12638: proof of identity retrieval failed" error was encountered. To search the internet for a bit. is due to advanced security validation by Oracle, the workaround is as follows: Configuration and Migration Tools, start-to-program, Oracle Net manager→ local → profile →oracle advanced security → validation → remove the "NTS" from the selected method to be able.

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ORA-12638: Unable to retrieve proof of identity resolution method