Knocking or Knockin or Knockin' may refer to: * Knocking, Austria, a hamlet, subdivision of Erlauf (municipality) in Austria * Knocking (2006 film), a documentary about Jehovah's Witnesses * Knocking (2021 film), a Swedish thriller film * "Knockin'" (song), by Spanish band Double Vision (1995) *

Engine knocking In spark ignition internal combustion engines, knocking (also knock, detonation, spark knock, pinging or pinking) occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignite ...

, or the sound accompanying automotive combustion malfunction *

Port knocking In computer networking, port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports. Once a correct sequence of connection attempts is received, the firewall rules a ...

, a covert method of opening a port on a server * Roof knocking, a bombing practice of the Israeli Defense Forces * Gene knockin, genetic engineering method * Knockin Castle, castle situated in the village of Knockin on Shropshire between Oswestry and Shrewsbury

See also