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1/22/2025 2:54:33 PM

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Section 24: Help With Forum
Subject: Certificate Issue? Msg# 1219369

From:

Stu Wayne

Joined 4/4/2000

To:

Joe Reynolds (Read) Outdoors Network

Joined 8/1/1999

Sorry, Joe - I didn't realize the messages were uploading to the forum despite the error message - sometimes... Roll Eyes

I also sent you an e-mail because I thought these weren't going through.

Mark - can you delete this and its duplicates?

Stu

For reference, the above message is a reply to a message where:
Joe, I'm getting the below message lately when replying to a forum message. Some times it takes a couple of tries to get through and today the reply went twice unknown to me. Anything you need to do?

Stu

---

MailKit.Security.SslHandshakeException: An error occurred while attempting to establish an SSL or TLS connection.

This usually means that the SSL certificate presented by the server is not trusted by the system for one or more of
the following reasons:

1. The server is using a self-signed certificate which cannot be verified.
2. The local system is missing a Root or Intermediate certificate needed to verify the server's certificate.
3. A Certificate Authority CRL server for one or more of the certificates in the chain is temporarily unavailable.
4. The certificate presented by the server is expired or invalid.
5. The set of SSL/TLS protocols supported by the client and server do not match.
6. You are trying to connect to a port which does not support SSL/TLS.

See https://github.com/jstedfast/MailKit/blob/master/FAQ.md#ssl-handshake-exception for possible solutions.

---> System.Security.Authentication.AuthenticationException: Cannot determine the frame size or a corrupted frame was received.
at System.Net.Security.SslStream.GetFrameSize(ReadOnlySpan'1 buffer)
at System.Net.Security.SslStream.EnsureFullTlsFrameAsync[TIOAdapter](CancellationToken cancellationToken, Int32 estimatedSize)
at System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder'1.StateMachineBox'1.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)
at System.Net.Security.SslStream.ReceiveHandshakeFrameAsync[TIOAdapter](CancellationToken cancellationToken)
at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](Boolean receiveFirst, Byte[] reAuthenticationData, CancellationToken cancellationToken)
at System.Net.Security.SslStream.AuthenticateAsClient(SslClientAuthenticationOptions sslClientAuthenticationOptions)
at MailKit.Net.Smtp.SmtpClient.Connect(String host, Int32 port, SecureSocketOptions options, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at MailKit.Net.Smtp.SmtpClient.Connect(String host, Int32 port, SecureSocketOptions options, CancellationToken cancellationToken)
at forums.Controllers.Classes.SendEmailSSLHostek.SendMailMessage(String from, String recipient, String bcc, String cc, String subject, String body, String RecipientName) in C:\inetpub\ForumsVS\forums\Controllers\Classes\SendEmailSSLHostek.cs:line 87

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