连接到服务器是正常的.问题似乎发生在ValidateCredentials中.

这是我的代码：

public static bool IsAuthenticated(string domain,string username,string pwd) {
    bool IsAuthenticated = false;

    try {
        PrincipalContext insPrincipalContext = 
            new PrincipalContext(ContextType.Domain,domain,"DC=c1w,DC=com");

        username = "c1w\\" + username;

        IsAuthenticated = insPrincipalContext.ValidateCredentials(username,pwd);
    }
    catch (Exception ex)
    {
        // Rethrow this exception
        ExceptionPolicy.HandleException(ex,"Exception Policy");
    }

    return IsAuthenticated;
}

任何人都知道为什么会发生这种情况？