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Third Party Email interface are failing ... on connection
Problem reported by Merle Wait - 10/13/2022 at 5:29 AM
Resolved
Have had several clients over the past three or four months report that their 3rd party CRMs are no longer able to send out email.
In all honesty I dismissed the first couple of complaints because didn't have a lot of complaints...  so my issues for not capturing this earlier..   and as to which release.
But here is the issue that I see
[2022.10.13] 07:20:57.886 [XXX.XXX.XX2.60][48811648] Exception: (PooledTcpItem.cs) Unable to read data from the transport connection: 
                            An established connection was aborted by the software in your host machine.
[2022.10.13] 07:20:57.886 [XXX.XXX.XX2.60][48811648] StackTrace:    at System.Net.Sockets.NetworkStream.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
[2022.10.13]    at System.Net.FixedSizeReader.StartReading()   at System.Net.Security._SslStream.StartFrameHeader(Byte[] buffer, Int32 offset, Int32 count,
                 AsyncProtocolRequest asyncRequest)   at System.Net.Security._SslStream.StartReading(Byte[] buffer,
                 Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)   
                    at System.Net.Security._SslStream.ProcessRead(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)   at System.Net.Security._SslStream.BeginRead(Byte[] buffer, Int32 offset, Int32 count, AsyncCallback asyncCallback, Object asyncState)   at MailService.TcpServerLib.Common.PooledTcpItem.BeginReceive()

The two CRMs that have reported in the past couple of day are:
    VTiger -CRM
    Suite - CRM

Please note.. I did see these same two CRMs connect to gmail without fail.. (customers had me do a zoom to watch).  So I know it is on my side, just not sure how to resolve


4 Replies

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0
Kyle Kerst Replied
Employee Post
This looks to be an SSL related issue at its core, which could be a variety of things. Are you familiar with OpenSSL? You could probe which SSL/TLS versions are supported for each to start, as mismatches here are common with system and application updates.
Kyle Kerst
Technical Support Specialist
SmarterTools Inc.
(877) 357-6278
www.smartertools.com
0
Merle Wait Replied
I am NOT familiar with OpenSSL.. however I think my network guy probably is... but he is not familiar with SmarterMail..     If you can point as to where to start.. we can give that a whirl  :)

0
Kyle Kerst Replied
Employee Post Marked As Resolution
I'd be happy to! I found a serverfault discussion about checking to see if TLS 1.2 (in particular) is available on a host, and someone provided a good example case:


If they have publicly accessible hostnames you can also run an automated test like this one:


That one will check pretty much everything relating to SSL/TLS via an HTTP/HTTPS interface, so if they have a public facing web interface you can run that against them then check the list of supported protocols. I hope that helps :)
Kyle Kerst
Technical Support Specialist
SmarterTools Inc.
(877) 357-6278
www.smartertools.com
0
Merle Wait Replied
So it was us.. somehow ended up with 2 different entries for SSL .. with one using IP address and one using  a second IP address.   Both IP addresses are valid.. but shouldn't have a separate entry.
Thanks.. for SSL info..  
Mystery solved.

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