China’s Great Firewall gets tougher to scale as popular VPN shut down
South China Morning Post, July 4, 2017
http://www.scmp.com/news/china/society/article/2101084/chinas-great-firewall-gets-tougher-scale-popular-vpn-shut-down
Related:
后会无期：中国VPN服务屡被叫停 (Farewell forever: popular VPN banned multiple times in China)
Voice of America, July 4, 2017
https://www.voachinese.com/a/china-vpn-20170703/3926844.html