What causes a TCP/IP reset (RST) flag to be sent?

Question

I\'m trying to figure out why my app\'s TCP/IP connection keeps hiccuping every 10 minutes (exactly, within 1-2 seconds). I ran Wireshark and discovered that after 10 minut

Answer 1

This is because there is another process in the network sending RST to your TCP connection.

Normally RST would be sent in the following case

• A process close the socket when socket using SO_LINGER option is enabled
• OS is doing the resource cleanup when your process exit without closing socket.

In your case, it sounds like a process is connecting your connection(IP + port) and keeps sending RST after establish the connection.