Determine if user is in AD group for .NET 4.0 application

Question

I am trying to determine if a user is a member of an Active Directory (AD) group for an internal ASP.NET 4.0 application. The code below throws an \"Attempted to access an

Answer 1

Could this bug be your problem?

I've solved the same problems using this workaround:

           using (DirectoryEntry rootDse = new DirectoryEntry("LDAP://rootdse"))
        {
            var dnsName = rootDse.Properties["dnsHostName"].Value.ToString();
            using (PrincipalContext ctx = new PrincipalContext(ContextType.Domain, dnsName)) {}

Answer 2

Same issue here.

It appears to be a bug in ADSI that was resolved with a hotfix. Windows 7 SP1 and Windows Server 2008 R2 SP1 don't include the fix, so it will need to be manually deployed on your development machines and server environments.

http://support.microsoft.com/kb/2683913