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Topic: NTLM auth not working on Exchange 2010

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hubertn
Newbie
Newbie

Joined: 04 June 2013
Location: Netherlands
Online Status: Offline
Posts: 1

Posted: 04 June 2013 at 4:46am \| IP Logged

Unable to send mail via SMTP on Exchange Server 2010 with SASL NTLM authentication. Error response is:
"The server has rejected authentication data sent by the client. The server responded: 535 5.7.3 Authentication unsuccessful"

Sample code used:
-----------------

using MailBee;
using MailBee.SmtpMail;
using MailBee.Security;

class Test
{
   [STAThread]
   static void Main(string[] args)
   {
      try
      {
        Global.LicenseKey = <snip>;
        Smtp mailer = new Smtp();

        // See in the log file what exactly happens during authentication.
        mailer.Log.Enabled = true;
        mailer.Log.Filename = "C:\\Temp\\log.txt";
        mailer.Log.Clear();

        // Use SMTP relay with authentication (take credentials from Windows).
        SmtpServer relay = mailer.SmtpServers.Add("ms-gda02.its.centric.lan", null, null);

        // Allow methods which can do Integrated Windows Authentication.
        relay.AuthMethods = MailBee.AuthenticationMethods.SaslNtlm | MailBee.AuthenticationMethods.SaslGssApi;
        relay.SmtpOptions = ExtendedSmtpOptions.NoChunking;
        relay.SslMode = SslStartupMode.UseStartTlsIfSupported;

        // Compose and send an e-mail.
        mailer.From.Email = "hubert.nooijen@centric.eu";
        mailer.To.Add("hubert.nooijen@centric.eu");
        mailer.Subject = "Test message";
        mailer.Send();
      }
      catch (Exception ex)
      {
        Console.WriteLine(ex.Message);
      }
   }
}

Log file contents:
------------------
[13:20:49.32] [INFO] Assembly version: 7.3.4.388.
[13:20:49.31] [INFO] Will send mail message.
[13:20:49.48] [INFO] Will resolve host "ms-gda02.its.centric.lan".
[13:20:49.49] [INFO] Host "ms-gda02.its.centric.lan" resolved to IP address(es) 10.15.1.8.
[13:20:49.49] [INFO] Will connect to host "ms-gda02.its.centric.lan" on port 25.
[13:20:49.51] [INFO] Socket connected to IP address 10.15.1.8 on port 25.
[13:20:49.52] [RECV] 220 MS-GDA02.its.centric.lan Microsoft ESMTP MAIL Service ready at Tue, 4 Jun 2013 13:20:48 +0200\r\n
[13:20:49.52] [INFO] Connected to mail service at host "ms-gda02.its.centric.lan" on port 25 and ready.
[13:20:49.54] [INFO] Will send Hello command (HELO or EHLO).
[13:20:49.56] [SEND] EHLO [10.15.240.68]\r\n
[13:20:49.56] [RECV] 250-MS-GDA02.its.centric.lan Hello [10.15.240.68]\r\n250-SIZE\r\n250-PIPELINING\r\n250-DSN\r\n250-ENHANCEDSTATUSCODES\r\n250-STARTTLS\r\n250-X-ANONYMOUSTLS\r\n250-AUTH NTLM\r\n250-X-EXPS GSSAPI NTLM\r\n250-8BITMIME\r\n250-BINARYMIME\r\n250-CHUNKING\r\n250-XEXCH50\r\n250 XRDST\r\n
[13:20:49.57] [INFO] SMTP Hello completed.
[13:20:49.57] [INFO] Notify server that we are ready to start TLS/SSL negotiation.
[13:20:49.57] [SEND] STARTTLS\r\n
[13:20:49.57] [RECV] 220 2.0.0 SMTP server ready\r\n
[13:20:49.95] [INFO] Will send Hello command (HELO or EHLO).
[13:20:49.95] [SEND] EHLO [10.15.240.68]\r\n
[13:20:49.95] [RECV] 250-MS-GDA02.its.centric.lan Hello [10.15.240.68]\r\n250-SIZE\r\n250-PIPELINING\r\n250-DSN\r\n250-ENHANCEDSTATUSCODES\r\n250-AUTH NTLM LOGIN\r\n250-X-EXPS GSSAPI NTLM\r\n250-8BITMIME\r\n250-BINARYMIME\r\n250-CHUNKING\r\n250-XEXCH50\r\n250 XRDST\r\n
[13:20:49.95] [INFO] SMTP Hello completed.
[13:20:49.96] [INFO] Will login as "".
[13:20:49.98] [INFO] Will try SASL NTLM authentication method.
[13:20:49.98] [SEND] AUTH NTLM\r\n
[13:20:49.98] [RECV] 334 \r\n
[13:20:49.99] [SEND] YHkGBisGAQUFAqBvMG2gMDAuBgorBgEEAYI3AgIKBgkqhkiC9xIBAgIGCSqGSIb3EgECAgYKKwYBBAGCNwICHqI5BDdOVExNU1NQAAEAAACXsgjiAwADADQAAAAMAAwAKAAAAAYBsR0AAAAPTkIyLUhOT09JSkVOSVRT\r\n
[13:20:54.98] [RECV] 535 5.7.3 Authentication unsuccessful\r\n
[13:20:56.05] [INFO] Will disconnect from host "ms-gda02.its.centric.lan".
[13:20:56.06] [INFO] Disconnected from host "ms-gda02.its.centric.lan".
[13:20:56.06] [INFO] Error: The server has rejected authentication data sent by the client. The server responded: 535 5.7.3 Authentication unsuccessful\r\n.
------------------

I'm completely puzzled as why this code fails, with or without SSL. Account name and password are NULL as required; if they're filled in the code succeeds and mail is sent, but this defeats the purpose of Integrated Windows Authentication!

Igor
AfterLogic Support

Joined: 24 June 2008
Location: United States
Online Status: Offline
Posts: 6104

Posted: 04 June 2013 at 11:55am \| IP Logged

I understand MS Exchange 2010 only supports GSSAPI authentication, so try using MailBee.AuthenticationMethods.SaslGssApi only and see if that helps.

--
Regards,
Igor, AfterLogic Support

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