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Something in the path between the client and the server is blocking the HTTP request. As the same packet is dropped over and over again, this is not random packet-loss. It could be an IPS (Intrusion Prevention System) or maybe a WAF (Web Application Firewall). Or it could be a Loadbalancer that does initiate the 3-way handshake but has to process the HTTP request first and somehow can't. It could also be a NGFW (Next Generation Firewall) that tries to understand the request, but is failing.

  1. Can you describe the infrastructure between the client and the server?
  2. Can you show the 32 bytes of the HTTP request? 32 bytes are a bit less than expected, so maybe the request itself is not fully compliant and that is the cause the intermediate device is blocking it.