git clone stuck on HTTP

I am trying to check out a repository from Github, I can use the git:// 开发者_StackOverflow中文版protocol, but not the http:// protocol. I would type git clone http://github.com/ajaxorg/cloud9.git and it would get stuck on cloning into cloud9 Does anyone know what's wrong?

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Use https:// instead of http://.

If that fails, try using something like strace to figure out what action it's getting stuck on.