Handshake failed due to an unexpected packet format
Problem reported by Merle Wait - 9/9/2019 at 2:35 PM
Resolved
Setting up an testing our shiny new server and Free SM16.x build  (whatever the current one is)....
Interfacing, or attempting to interface to outbound SM15.x gateway...
Receive this error:
16:28:30.730 [26000] Exception: The handshake failed due to an unexpected packet format.
   at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
   at MailService.RelayServer.Clients.SMTP.ClientConnectionSync.InitiateSsl(Boolean validateAllCerts)
   at MailService.RelayServer.Clients.SMTP.SmtpClientSession.Initialize(String senderAddress, List`1 recipientList, String destServerIP)
~~~
Not sure what that means, or what I need to do resolve.
The current outbound gate-way is being used by the prod box as well.. so new test server and prod server using the same outbound gateway.. Is that the problem?

3 Replies

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1
Kyle Kerst Replied
Employee Post Marked As Resolution
Hello Merle, I believe these issues might be stemming from mismatched SSL/TLS versions between the servers. Can you try running IIS Crypto from Nartac Software, hit the Best Practices button and then give the servers a reboot and try again? Please let me know if that helps. Have a great day!
Kyle Kerst
Technical Support Specialist
SmarterTools Inc.
(877) 357-6278
www.smartertools.com
1
Merle Wait Replied
that worked  - Thanks !
0
Kyle Kerst Replied
Employee Post
Thats great to hear Merle, thanks for following up with me on this. Have a great rest of your week!
Kyle Kerst
Technical Support Specialist
SmarterTools Inc.
(877) 357-6278
www.smartertools.com

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