I worked for a company in the past which had manufactured some simple electronics in china. The person communicating on behalf of the chinese company mentioned she cannot send emails from the manufacturing facility because there was network access possible only within china. To send mail abroad she had to go to some other place, like internet cafe but that was run by the state. She had trouble resetting password on our server because clicking on the link in email failed, our server was unreachable from there (from the "cafe").