title: Knocking
text: # Knocking
  
  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, or the sound accompanying automotive combustion malfunction
  * Port knocking, 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
  