


Why Is My Gmail SMTP Connection Failing with an 'Invalid Certificate' Error?
Jan 12, 2025 am 09:51 AMTroubleshooting Gmail SMTP's "Invalid Certificate" Error:
Sending emails via Gmail's SMTP server might trigger the error "The remote certificate is invalid according to the validation procedure." This article explains the cause and offers a temporary solution.
The problem lies in the certificate validation process. Gmail's SMTP server uses a security certificate to verify the authenticity of email data. If your client's validation process rejects the server's certificate, this error appears.
Temporary Solution (For Debugging Only):
To temporarily bypass certificate validation (strongly discouraged for production environments due to significant security risks), use this method before initiating smtpclient.Send()
:
[Obsolete("Never use this in production code!", true)] static void DisableCertificateValidation() { // Disabling certificate validation exposes your application to man-in-the-middle attacks, // allowing attackers to potentially intercept and read your encrypted messages. // See: https://stackoverflow.com/a/14907718/740639 ServicePointManager.ServerCertificateValidationCallback = (s, certificate, chain, sslPolicyErrors) => true; }
This code tells the .NET Framework to accept any server certificate. Repeat: Only use this for diagnostic purposes. Never deploy code with certificate validation disabled. Implementing this solution in a production setting severely weakens your application's security.
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