Message Oracle ORA-12638 - Credential retrieval failed

ERRORCredential retrieval failed
CAUSEThe authentication service failed to retrieve the credentials of a user.
ACTIONEnable tracing to determine the exact error.

425828ORA-12638 credential retrieval failed (Windows 2000)
608280ora-12638 when starting svrmgrl
614036Composite SAP Note: ORA-12631/ORA-12638
620540Authentication Troubleshooting Guide
480266Problems with the SYSDBA/SYSOPER/INTERNAL connect