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Look this thread is about the same error : "ora-12638 credential retrieval failed" .
Also read http://www.dba-oracle.com/t_ora_12638_credential_retrieval_failed.htm
Kind regards, Bruno Reis.
Thanks for the reply, Bruno. Helpful information on that thread but I don't think it resolves my problem.
To simply my problem, does anyone know if there is any issue with setting SQLNET.AUTHENTICATION_SERVICES= (NONE) on the the database home of RAC, but leave the SQLNET.AUTHENTICATION_SERVICES= (NTS) on the Grid Infrastructure home?