ORA-12638: Credential retrieval failed

Question

I have a legacy VB6 application which I\'ve inherited. The issue I\'m facing is that I\'m getting the infamous

ORA-12638: Credential retrieval failed
         


        

Answer 1

Know it's an old question but it has started appearing with the recent Windows update. The way to easily solve it is to set

SQLNET.AUTHENTICATION_SERVICES= (NONE)

in the sqlnet.ora.