From An update on the censorship in Ethiopia | The Tor Blog.

A few days ago, we published a blog post exposing the use of Deep Packet Inspection (DPI) to filter all Internet traffic in Ethiopia, including connections to the Tor network. We concluded that they are doing some sort of TLS fingerprinting, but had not been able to figure out exactly what they are fingerprinting on. Since then, we have managed to determine exactly how Ethiopia blocks Tor and we have developed a workaround. We will publish a full technical analysis very soon.

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Comments:

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On June 4th, 2012 Anonymous said:

Currently the parliament has approved a bill that leads to 15 years of imprisonment and 150K Birr fine [about £5500 – ed] if some one is found using illegal (As to the law of the government) sites and services. So guys, be serious to what you are using and let others use.

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On June 4th, 2012 Anonymous said:

To all of you TOR developers, thank you. You’re building up massive karma points squinting into your monitor screens, scratching your heads, and alternatively staring out the window as you figure out all these solutions time and time again. Your work has aided so many people who rely on TOR — Internet access and participation in social networking activities can have a very profound effect in countries where oppressive governments (their numbers are sadly increasing) want to keep their own citizens in seclusion by restricting the sharing of ideas, information, and community involvement. Facebook loves to bask in the news media glory for things like the ‘Arab Spring’ social upheavals but most of us know that TOR was the real infrastructure and backbone for Internet access.