Failed to connect to third party, using smtp client?

Guest User

Hi Team

I have this issue, each time i am registering the new user, its connection failure to third party. I am using smtp client mail and this domain is gmail. The question why am i getting this often and its not even send a confirming email to the user. It does writes this query to the database colum. What could an issue?

[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public async Task Register(RegisterViewModel model)
{
if (ModelState.IsValid)
{
var user = new ApplicationUser() { UserName = model.UserName };
user.Email = model.Email;
user.ConfirmedEmail = false;
var result = await UserManager.CreateAsync(user, model.Password);
if (result.Succeeded)
{
System.Net.Mail.MailMessage m = new System.Net.Mail.MailMessage(
new System.Net.Mail.MailAddress("[email protected]", "Web Registration"),
new System.Net.Mail.MailAddress(user.Email));
m.Subject = "Email confirmation";
m.Body = string.Format("Dear {0}
Thank you for your registration, please click on the below link to complete your registration: {1}", user.UserName, Url.Action("ConfirmEmail", "Account", new { Token = user.Id, Email = user.Email }, Request.Url.Scheme));
m.IsBodyHtml = true;
System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.gmail.com");
smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "password");
smtp.EnableSsl = true;
smtp.Send(m);
return RedirectToAction("Confirm", "Account", new { Email = user.Email });
}
else
{
AddErrors(result);
}
}
// If we got this far, something failed, redisplay form
return View(model);
}

5 Replies

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Guest User6y ago
Hi Amit

1. First my apps are secure on
2. The app is on development stage not Production
3. All the steps were followed still same issue persist

What could be an issue other than this?
Amit Mohanty6y ago
You must check whether the Username and Password supplied are correct. If your Username and Password are correct but still you get an error, check your "Allows less secure apps" option of the given email. If this option is off, then turn it on. To check "Allows less secure apps" setting, first, log in to your Gmail account then visit the below link.

Link - https://myaccount.google.com/lesssecureapps

Check the below link

https://www.c-sharpcorner.com/article/send-email-using-asp-net-mvc-and-web-api/

Another Case: When you try to login from the domain other than your time zone/domain/computer (This is the case in most of the scenarios when sending mail from code)

solution 1: You need to review the activity. but reviewing the activity will not be helpful due to the latest security standards the link will not be useful. So try the below case.

solution 2: If you have hosted your code somewhere on the production server and if you have access to the production server, then take the remote desktop connection to the production server and try to log in once from the browser of the production server. This will add an exception for login to google and you will be allowed to login from code.

But what if you don't have access to the production server. try the solution 3

solution 3: You have to enable login from other timezone / IP for your google account.

to do this follow the link https://g.co/allowaccess and allow access by clicking the continue button.
Guest User6y ago
Hi Amit

I have modified this method as given changes shown by you, now the issue is on Sending the mail. The error is attached as being not secure, last question how do i validate if the mail is not?
Amit Mohanty6y ago
Hey try this
var mailMessage = new MailMessage();
mailMessage.To.Add(new MailAddress("tomailaddress"));
mailMessage.From = new MailAddress("Amit Mohanty ");
//mailMessage.Bcc.Add(new MailAddress("Amit Mohanty "));
mailMessage.Subject = "Your Subject";
mailMessage.IsBodyHtml = true;
mailMessage.Body = "Your Mail Body";
using (var smtp = new SmtpClient())
{
    var credential = new NetworkCredential
    {
        UserName = "your mail id",
        Password = "your password"
    };
    smtp.Credentials = credential;
    smtp.Host = "smtp.gmail.com";
    smtp.Port = 587;
    smtp.EnableSsl = true;
    smtp.Send(mailMessage);
}
Salman Beg6y ago
Hey you are missing the Port and Host.
Check this which may help you to get clear idea,

https://www.c-sharpcorner.com/article/sending-email-using-c-sharp/

Thanks.