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Good day,

I am trying to debug problematic case with FIX message is being lost on regular basis. What I mean by this, is there are two applications (FIX client and FIX server). Those applications establish connection and start exchanging Hearbeat messages. When finally client application decides to send order message (this message is of longer size and can not fit in one packet, it takes 2-3 packets normally), connection drops with "An existing connection was forcibly closed by the remote host." message produced by both application's network api (Windows).

I have recoded pcap file

I wonder would could be possible reason, or if unclear, what should I review / check next.

Thank you for your help.

Good day,

I am trying to debug problematic case with FIX message is being lost on regular basis. What I mean by this, is there are two applications (FIX client and FIX server). Those applications establish connection and start exchanging Hearbeat messages. When finally client application decides to send order message (this message is of longer size and can not fit in one packet, it takes 2-3 packets normally), connection drops with "An existing connection was forcibly closed by the remote host." message produced by both application's network api (Windows).

I have recoded pcap file

I wonder would could be possible reason, or if unclear, what should I review / check next.

Thank you for your help.

Good day,

I am trying to debug problematic case with FIX message is being lost on regular basis. What I mean by this, is there are two applications (FIX client and FIX server). Those applications establish connection and start exchanging Hearbeat messages. When finally client application decides to send order message (this message is of longer size and can not fit in one packet, it takes 2-3 packets normally), connection drops with "An existing connection was forcibly closed by the remote host." message produced by both application's network api (Windows).

I have recoded pcap file

I wonder would could be possible reason, or if unclear, what should I review / check next.

Thank you for your help.

Update 1: Adding previous day pcap file as requested by Christian_R in comments.