VPN blocking

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VPN blocking is technology used to block the encrypted protocol tunneling communications methods used by Virtual Private Network (VPN) systems. It can be used as a tool for either computer security or Internet censorship, by preventing the use of VPNs to bypass network firewall systems.

Starting late 2012, the Great Firewall of China became able to "learn, discover and block" the encrypted communications methods used by a number of different VPN systems. China Unicom, one of the biggest telecoms providers in the country, is now blocking connections where a VPN is detected, according to one company with a number of users in China.[1]

The government of Iran has also been reported to be using VPN blocking technology.[2]


  1. ^ Arthur, Charles (14 December 2012). "China tightens 'Great Firewall' internet control with new technology". guardian.co.uk. The Guardian. Retrieved 2013-06-11. 
  2. ^ Eric Limer (10 March 2013). "Iran's Blocking VPNs To Tighten Its Stranglehold on the Internet". Gizmodo. 

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