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I have a python based HTTP client and a server. Lately I saw several timeouts on the client's end when POSTing data.

I ran a Tcpdump on both the ends and figured out that the client was replying with ACK in the TCP handshake.I saw that the client was sending only S flags whereas the server was sending S. flags.

Any idea why this would happen or how to troubleshoot it ?

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  • Did you write this software yourself? Does the software use raw sockets or the native TCP socket stack? Jul 26, 2017 at 14:08
  • It uses the request module in python. So, uses the native TCP sockets Jul 26, 2017 at 14:14

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