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.NET Forum / .NET Framework / General / March 2008SmtpClient.UseDefaultCredentials does not work in Authenticated SM
I use SmtpClient to send email in my program, and I set the UserDefaultCredentials to true to use the logged on user's credentials. However it doesn't work on authenticated SMTP server. It will throws exception saying 'System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.3 Client was not authenticated' However if I set UserDefaultCredentials to false and hard-coded my login and password for SmtpClient.Credentials, it works. It seems as if the UseDefaultCredentials does not set loggon user's credentials correctly. Any help would really appreciated. Vik Hello, what SMTP server are you using? If you use the credential of the currently logged on user, the mail server must support NTLM authentication. If it just supports the LOGIN method, it won't work. To check if the server supports this, open a command prompt and type telnet servername 25 this will open a connection to the smtp server. Then type ehlo This will send an extended helo request to the server. The server will now list all supported commands. If you find a line stating 250-AUTH NTLM the server has NTLM authentication enabled. If not - you can't use the default credentials. Kind regards, Henning Krause >I use SmtpClient to send email in my program, and I set the > UserDefaultCredentials to true to use the logged on user's credentials. [quoted text clipped - 12 lines] > > Vik Hi Henning, Thank you very much for your reply to my question. You are right; it was the SMTP server not supporting NTLM issue, and after we have SMTP server's settings changed to support NTLM, the email client was able to send email sucessfully. Again, I really appreciate your help. Best Regards, Vik > Hello, > [quoted text clipped - 35 lines] > > > > Vik Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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