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ORA-12638: Credential retrieval failed 

Dr. Xi
Joined:
04/09/2007
Posts:
753

November 22, 2008 00:28:53    Last update: February 03, 2010 15:49:55
I got "ORA-12638: Credential retrieval failed" while trying to log in an Oracle database. But my colleagues had no problems at all. 
C:\tmp>sqlplus scott@xe

SQL*Plus: Release 10.1.0.5.0 - Production on Fri Nov 21 18:12:43 2008

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

Enter password:
ERROR:
ORA-12638: Credential retrieval failed

Enter user-name:


Changing SQLNET.AUTHENTICATION_SERVICES in sqlnet.ora from NTS to NONE fixed the problem. 
SQLNET.AUTHENTICATION_SERVICES= (NONE)
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