Only from the TOR guys: - https://blog.torproject.org/blog/iran-blocks-tor-tor-releases-same-day-fix https://blog.torproject.org/blog/iran-blocks-tor-tor-relea

Only from the TOR guys: - https://blog.torproject.org/blog/iran-blocks-tor-tor-releases-same-day-fix https://blog.torproject.org/blog/iran-blocks-tor-tor-release... Iran detects ssl parameters and block suspicious connections (they based it on the expiry time of the session certificates) - http://www.telegraph.co.uk/news/worldnews/middleeast/iran/8388484/Iran-cracks-down-on-web-dissident-technology.html http://www.telegraph.co.uk/news/worldnews/middleeast/iran/83... - http://www.christopher-parsons.com/blog/technology/is-iran-now-actually-using-deep-packet-inspection/ http://www.christopher-parsons.com/blog/technology/is-iran-n... Btw. it is not only Iran running country wide DPI - have a look at http://www.youtube.com/watch?v=DX46Qv_b7F4 http://www.youtube.com/watch?v=DX46Qv_b7F4 about the different techniques currently used to block/prevent access to VPNs/Tor etc. (edit: added some additional links)