keepalive

Noun

Meaning

English Wikipedia has an article on:keepaliveWikipedia
keepalive (plural keepalives)

(electronics, communication) A short message sent by one device to another to check that the link between the two is operating, or to prevent this link from being broken due to inactivity.

Source: en.wiktionary.org

Examples

In the "Established" state, the router can send/receive: Keepalive; Update; and Notification messages to/from its peer. Source: Internet

Keepalive messages are exchanged and, upon successful receipt, the router is placed into the "Established" state. Source: Internet

The NGINX directives were used to quickly close keepalive connections. Source: Internet

Your points about DDoS and performance are correct, but there is a fairly simple way to use a keepalive timeout for performance without worrying that attackers will open more TCP connections than your server can handle. Source: Internet

Close letter words and terms

keep-worthy keepability keepable keepe keeper keeper of the flame