Getting Android source

I trying to get the source of android using repo and git. Everytime I do a repo sync, the terminal indicates that it is fetching projects but it will freeze at that particular line for ho开发者_如何学Gours. I am guessing that my network is behind a firewall. Which port should I open? or What should I do?

Repo is a tool build to manage git repositories, and git servers listen on port 9418 (TCP) so you would need to set up your firewall to allow appropriate access to destinations on that port.

Is this a corporate network/firewall? If it's a home network then that might not be the problem, since having such a rule to block that by default seems a little strict. Might it be a proxy problem?