Netflix came under pressure from major film studios in September 2014 to block VPN access, as up to 200,000 Australian subscribers were using Netflix despite it not being available yet in Australia. See also: Criticism of Netflix § Allowing users to bypass geo-blocking For instance, as the Chinese government began using deep packet inspection to identify VPN protocols, the firm Golden Frog began scrambling OpenVPN packet metadata for its popular VyprVPN service in an attempt to avoid detection. Īs organizations have ramped up efforts to block VPN access which bypasses their firewalls, VPN providers have responded by utilizing more sophisticated techniques to make their connections less conspicuous. Some governments have been known to block all access to overseas IP addresses, since VPN use can involve connecting to remote hosts that do not operate under that government's jurisdiction. Similarly, a service can prohibit access by blocking access from IP addresses and IP address ranges that are known to belong to VPN providers. Ports that are used by common VPN tunneling protocols, such as PPTP or L2TP, to establish their connections and transfer data can be closed by system administrators to prevent their use on certain networks. Blocking VPN access can be done a few different ways.
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