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https://www.ibm.com/docs/en/zos/2.3.0?topic=interfaces-tcp-keepalive-socket-option#:~:text=Table%201.%20TCP_KeepAlive%20time%20values%20%20%20,T%20%2B%205%20%209%20more%20rows%20
https://www.ibm.com/docs/en/zos/2.3.0?topic=interfaces-tcp-keepalive-socket-option
https://stackoverflow.com/questions/3907537/keep-alive-tcp-ip-connected-sockets-over-the-internet-when-how-and-how-much
TCP/IP connections KeepAlives are specified to be at most once every two hours. That's not what it says. It says 'This interval MUST be configurable and MUST default to no less than two hours.'. The problem is this was written in 1989 and is concerned about the cost of sending the extra KeepAlive packet!
https://tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html
This means that the keepalive routines wait for two hours (7200 secs) before sending the first keepalive probe, and then resend it every 75 seconds. If no ACK response is received for nine consecutive times, the connection is marked as broken.
https://support.esri.com/en/technical-article/000006285
By default, 'keepalive' is set to 7200000ms (2 hours). This means that every 2 hours the server machine tests the idle TCP connection by pinging the client machine from where the connection is coming. If the server gets no response back from the client, then 'keepalive' terminates the …
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