The system I developed for customers needs to verify whether the ad account password is correct.

I just know that their AD account authentication is integrated with OKTA.

I find some documents and try to use okta.auth.sdk for .net

        var client = new AuthenticationClient(new OktaClientConfiguration

        {

          OktaDomain = "https://aaaaaaa.okta.com/",

          Token = "00EzHsUCWkG4tvjMYXl1pUS1i0XIIUbfm65jpPHgST",

          DisableHttpsCheck = true

        });

        AuthenticateOptions option = new AuthenticateOptions();

        option.Username = "zhenglong.liu";

        option.Password = "P@ssw0rd";

        Task<IAuthenticationResponse> res = client.AuthenticateAsync(option);

        if (res.Result.AuthenticationStatus == AuthenticationStatus.Success)

        {

          Console.WriteLine("S");

        }

but it always throw an exception: An existing connection was forcibly closed by the remote host

help..