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In page Great Firewall:
"
- The OpenVPN protocol is detected and blocked. Connections not using symmetric keys or using "tls-auth" are blocked at handshake, and connections using the new "tls-crypt" option are detected and throttled (under 56 kbit/s) by the QoS filtering system.[citation needed]
- GRE tunnels and protocols that use GRE (e.g., PPTP) are blocked.[citation needed]
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