.Net's Directory Services throws a strange exception

c# .net ldap directory service
Noich picture Noich · Sep 12, 2010 · Viewed 24.8k times · Source

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

pwDev picture pwDev · Jun 13, 2012

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***);

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