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Errors when sending email via SMG from Exchange

  • 1.  Errors when sending email via SMG from Exchange

    Posted May 24, 2023 09:22 AM

    When Exchange (from Outlook) is sending emails via SMG i have errors in SMG "Abort message (message time out)". Problem was reported to Broadcom Support and after looking at packet capture they found that Exchange send data packet to SMG, SMG sends ACK to Exchange, SMG sends ACK with TCP widow update to Exchange, five minutes after most recent ACK no other packets have been received form Exchang and SMG time out the sesion. 
    In Exchange transport service logs I have 

    2023-05-18T20:18:41.277Z,SMG,08DB53CAAC00F8FF,21,192.168.45.35:49461,192.168.45.41:25,*,,"HandleError has encountered a suspicious connection reset from a remote, non-mailbox transport server."

    From Exchange Queue 

    [{LED=450 4.4.318 Connection was closed abruptly (SuspiciousRemoteServerError)} Exchange 2016

    Emails sended via OWA are working fine



  • 2.  RE: Errors when sending email via SMG from Exchange

    Posted May 24, 2023 09:24 AM
    Certificate issues. ?




  • 3.  RE: Errors when sending email via SMG from Exchange

    Posted May 24, 2023 09:34 AM

    After 4 atempts message is sent. To low max connection in Exchange connector?




  • 4.  RE: Errors when sending email via SMG from Exchange

    Posted May 24, 2023 09:43 AM
    If smg is closing the connection, then it’s smg. I ask again. Tls cert????




  • 5.  RE: Errors when sending email via SMG from Exchange

    Broadcom Employee
    Posted May 24, 2023 09:50 AM

    I just said that it wasn't an action from SMG, that's not what "Abort message (message timed out)" means. There's not enough info to indicate a potential cert related issue, I mentioned that the statements about the packets lacked context. However it's not SMG that is closing the connection. 
    If it were cert related, it wouldn't likely be directly related to the cert. It wasn't a cert failure, which would have specific responses, it was a timeout due to lack of network packet responses to the Messaging Gateway.



    ------------------------------
    ---------------------------------------------
    Support Engineer
    * Integrated Cyber Defense Exchange
    * Messaging Gateway
    * Packet Shaper
    Symantec Enterprise Division
    Broadcom Software
    ------------------------------



  • 6.  RE: Errors when sending email via SMG from Exchange

    Broadcom Employee
    Posted May 24, 2023 09:41 AM

    Sounds like something might be between SMG and Exchange that should be looked at. the "Abort message (message timed out)" specifically means that the Messaging Gateway was communicating with the other server but the network connection was lost (not due to direct action from SMG). Your description of the packet capture lacked context, but in general you said that SMG sent an ACK (meaning it acknowledged Exchanges previous packet) and would generally then be waiting for Exchange's next packet, which never arrived - ending in time out.
    Your Exchange logs seem to indicate that Exchange thought SMG stopped responding. Thus, most likely culprit is something in between.



    ------------------------------
    ---------------------------------------------
    Support Engineer
    * Integrated Cyber Defense Exchange
    * Messaging Gateway
    * Packet Shaper
    Symantec Enterprise Division
    Broadcom Software
    ------------------------------



  • 7.  RE: Errors when sending email via SMG from Exchange

    Posted May 24, 2023 10:19 AM

    Description of pacet capture is from Case 33390143. Exchange and VM are in VLAN, same site maybe sometimes different host. But from OWA mails are working. From transport service logs i se that certificate negotiation using tls 1.2 is succeded 




  • 8.  RE: Errors when sending email via SMG from Exchange

    Posted May 24, 2023 10:39 AM
    The issue is new???
    On May 24, 2023, at 10:18 AM, Tomasz Zielinski via Broadcom <mail@broadcom.com> wrote:

    Description of pacet capture is from Case 33390143. Exchange and VM are in VLAN, same site maybe sometimes different host. But from OWA mails are... -posted to the "Messaging Gateway" community <https: community.broadcom.com=""> Messaging Gateway <https: community.broadcom.com/symantecenterprise/communities/community-home/digestviewer?communitykey="bba1e9dc-0c56-4fb5-9e3d-ef7f0d79b7ee"> Post New Message <broadcom-messaginggateway@connectedcommunity.org> Re: Errors when sending email via SMG from Exchange <https: community.broadcom.com/symantecenterprise/discussion/errors-when-sending-email-via-smg-from-exchange#bm7a5d48ce-a4de-4d38-afbe-01884e1ab3b1=""> Reply to Group <broadcom_messaginggateway_7a5d48ce-a4de-4d38-afbe-01884e1ab3b1@connectedcommunity.org?subject=re: errors="" when="" sending="" email="" via="" smg="" from="" exchange=""> Reply to Sender <https: community.broadcom.com/symantecenterprise/communities/all-discussions/postreply?messagekey="7a5d48ce-a4de-4d38-afbe-01884e1ab3b1&ListKey=c7074c2b-e593-418f-9d9e-0567f9e41e52&SenderKey=81914f51-0b1c-4fcc-a347-01884c9ab40f"> <https: community.broadcom.com/network/members/profile?userkey="81914f51-0b1c-4fcc-a347-01884c9ab40f"> May 24, 2023 10:19 AM Tomasz Zielinski <https: community.broadcom.com/network/members/profile?userkey="81914f51-0b1c-4fcc-a347-01884c9ab40f">
    Description of pacet capture is from Case 33390143. Exchange and VM are in VLAN, same site maybe sometimes different host. But from OWA mails are working. From transport service logs i se that certificate negotiation using tls 1.2 is succeded
    Reply to Group Online <https: community.broadcom.com/symantecenterprise/communities/all-discussions/postreply?messagekey="7a5d48ce-a4de-4d38-afbe-01884e1ab3b1&ListKey=c7074c2b-e593-418f-9d9e-0567f9e41e52"> Reply to Group via Email <broadcom_messaginggateway_7a5d48ce-a4de-4d38-afbe-01884e1ab3b1@connectedcommunity.org?subject=re: errors="" when="" sending="" email="" via="" smg="" from="" exchange=""> View Thread <https: community.broadcom.com/symantecenterprise/discussion/errors-when-sending-email-via-smg-from-exchange#bm7a5d48ce-a4de-4d38-afbe-01884e1ab3b1=""> Recommend <https: community.broadcom.com:443/symantecenterprise/discussion/errors-when-sending-email-via-smg-from-exchange?messagekey="7a5d48ce-a4de-4d38-afbe-01884e1ab3b1&cmd=rate&cmdarg=add#bm7a5d48ce-a4de-4d38-afbe-01884e1ab3b1"> Forward <https: community.broadcom.com/symantecenterprise/communities/all-discussions/forwardmessages?messagekey="7a5d48ce-a4de-4d38-afbe-01884e1ab3b1&ListKey=c7074c2b-e593-418f-9d9e-0567f9e41e52"> Flag as Inappropriate <https: community.broadcom.com/symantecenterprise/discussion/errors-when-sending-email-via-smg-from-exchange?markappropriate="7a5d48ce-a4de-4d38-afbe-01884e1ab3b1#bm7a5d48ce-a4de-4d38-afbe-01884e1ab3b1">