The SMTP server has unexpectedly disconnected

when sending email

From Visual sutudio Works fine, and from local machine IIs Works fine too

But in the VPS Windows server  server IIS, Gives this error

SmtpProtocolException: The SMTP server has unexpectedly disconnected.

I am using MailKit for sending emails

using MailKit.Net.Smtp;
using MimeKit;

This is my Code

            var email = Client.email;
            var emailMessage = new MimeMessage();
            emailMessage.From.Add(new MailboxAddress("My Name", "myemail@live.com.mx"));
            emailMessage.To.Add(new MailboxAddress("somebody@mail.com", email));
            emailMessage.Subject = "Hello from Compucaribe";
            var builder = new BodyBuilder();
            builder.TextBody = @"Hello this is a test email";
            builder.Attachments.Add(Path + @"\directory\" + "file" + ".xml");
            builder.Attachments.Add(Path + @"\directory\" + "file" + ".pdf");

            emailMessage.Body = builder.ToMessageBody();

            using (var client = new SmtpClient())
            {
                client.Connect("smtp.live.com", 587, false);
                client.AuthenticationMechanisms.Remove("XOAUTH2");
                client.Authenticate("myemail@live.com.mx", "mypassword");
                client.Send(emailMessage);
                client.Disconnect(true);
            }