3.9.6.3 KeepAlive Timer Event

A KeepAlive Event SHOULD trigger an encapsulated protocol message such as an SSTP_NOOP command to be sent across the wire<66>. Well behaved connections will see this event every KeepAlive interval. All SOCKS connections SHOULD use KeepAlive timers. Well behaved connections will see this event every KeepAlive interval.