Ldap authentication on Vista?

[Ronni Marker]

Hi Guys, Have on Windows XP been using the following code to authenticate if username and password are valid up against Active Directory. But found out that my apps are not working on Visa OS as it always return false, even if user + pw is correct - on XP no problems works 110% fine there, but on vista.. urgh!

    private bool doAuthenticate(string szController)
    {
        string path = "LDAP://" + szController;
        DirectoryEntry de = null;
        
        if (szUserName == null)
        {
            de = new DirectoryEntry(path);
        }
        else
        {
            de = new DirectoryEntry(path, "\\\\" + szUserName, szPassword);
        }
        
        try
        {
            Object native = de.NativeObject;
            return true;
        }
        catch (Exception ez)
        {
            return false;
        }
    }

Any who have an idea on what is happening? Cheers,