.Net’s Directory Services throws a strange exception

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I had this problem too using IIS Express and VS 2010. What fixed it for me was a comment on another thread.

Validate a username and password against Active Directory?

but i’ll save you the click and search… 🙂 Just add ContextOpations.Negotiate to you Validate Credentials call like below.

bool valid = context.ValidateCredentials(user, pass, ***ContextOptions.Negotiate***);

I had this issue: things were working on my dev machine but didn’t work on the server. Turned out that IIS on the server was set up to run as LocalMachine. I changed it to NetworkService (the default) and things started working.

So basically check the user of the app pool if this is running on IIS.

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