Three foreign companies that enable Internet users in China to get around the "Great Firewall" of censors say they are having trouble serving their clients, which is complicating the work of foreign journalists and businesses. Virtual private network (VPN) providers Astrill, WiTopia, and StrongVPN published blog posts and sent letters to customers this week saying their servers are being blocked in China because of seeming changes in the firewall. The companies had not responded ...
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