If you try to connect Oracle from .NET code (in my case its Oracle XE
with VB.NET code) and if you are getting error "ora-12638 credential retrieval failed"
then try following to resolve this issue.
Open sqlnet.ora file and change the following entry
Existing Entry - SQLNET.AUTHENTICATION_SERVICES= (NTS)
Modified Entry - SQLNET.AUTHENTICATION_SERVICES= (NONE)
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