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Via our testing of QAuthenticator class, it seems that if we invoke QAuthenticator->setUser() with a username that is in the format "domain\username", it does not work. If instead we invoke it with just the "username", it works. Now I tried to test this for BASIC/ NTLMv1 auth schemes. So the weird thing is that only NTLM(v1) has this problem. BASIC works just fine with "domain\username".