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I think I understand the series of events.
- The TCP client's window is zero.
- The TCP server sends TCP window probes because it is waiting for the client to update the window size.
- The server sends HTTP GOAWAY to terminate the HTTP session. Afterwards, it either sends a TCP FIN or RESET
I would start Wireshark and then have the client try to duplicate the issue. When the client experiences the issue, immediately stop Wireshark and save the data to a file. If the file is large, you may have to filter for HTTP GOAWAY and then export that stream to another file. If more data is needed, the original file is available.