Cannot get reports to send through Gmail

Support
1

I have utilized the suggested settings in this forum…the sending Gmail account has 2FA enabled…so using an app password in Duplicati.

However, this is the error:

[Warning-Duplicati.Library.Modules.Builtin.ReportHelper-ReportSubmitError]: Failed to send message: MailKit.Security.SslHandshakeException: An error occurred while attempting to establish an SSL or TLS connection. The server’s SSL certificate could not be validated for the following reasons: • The server certificate has the following errors: • The revocation function was unable to check revocation for the certificate. → System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure. SslHandshakeException: An error occurred while attempting to establish an SSL or TLS connection. The server’s SSL certificate could not be validated for the following reasons: • The server certificate has the following errors: • The revocation function was unable to check revocation for the certificate.

If any settings for using Gmail as the sending STMP provider have changed, would love to know. Thanks for any assistance.

2

I expect that suggestions vary. Can you be more specific? Redact as needed for privacy.

EDIT:

What OS? Any special security apps or network boxes that might be blocking web sites?