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

If there is a router doing NAT, especially a low end router with few resources, it will age the oldest TCP sessions first. To do this it sets the RST flag in the packet that effectively tells the receiving station to (very ungracefully) close the connection. this is done to save resources.