Detection of Half-Open (Dropped) ConnectionsThere is a three-way handshake to open a TCP/IP connection, and a four-way handshake to close it. However, once the connection has been established, if neither side sends any data, then no packets are sent over the connection. TCP is an “idle” protocol, happy to assume that the connection is active until proven otherwise. TCP was designed this way for resiliency and efficiency. This design enables
