c# - .Net's Directory Services throws a strange exception

Question

I have a small C# solution used to check users credentials. It works fine for two of my teammates, but on my PC I get an exception.

The relevant code:

PrincipalContext context = new PrincipalContext(ContextType.Domain);
if (context.ValidateCredentials(System.Environment.UserDomainName + "" + usr, pwd))
     return true;
else
     return false;

And the exception is:

DirectoryOperationException, "The server cannot handle directory requests.".

I tried creating context with the explicit server name and the 636 port number, but this didn't help as well.

Any ideas?

Answer 1

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***);