Thursday, January 30, 2020

TCP/IP Question from a programmer (windows)

We had a situation where client talks to server (both Windows machines). The server showed that there is a TCP connection open. "netstat -a" showed it as ESTABLISHED to client_ip. But when we ran "netstat -a" on client it did not show any connection to the server.

There is a firewall (physical box) between Client and Server and normally connections work.

So question to networking gurus :)

  • Is it possible?
  • If it is possible does it mean that Firewall or one of the switches at fault here?

PS: I am a developer and until now i did not think it is possible to have TCP connection in "ESTABLISHED" state on the Server and not to even exist on a Client.



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