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Amy commented on How The Great Firewall of China Works

The issue is not so much blocking VPN but interrupting it, effectively knocking you offline.
They don't even need DPI. Just look at the traffic. If you see someone sending all their data with SSH (or OpenVPN) headers out of a specific port, just kill the connection. Luckily they don't seem to focus on all types of packets and all ports at the same time. So one day SSH tunneled OpenVPN packets over port 465 seem to work while the same thing on 443 doesn't work, the next day it might be the opposite.  It's honestly more psyops than it is technical network wizardry. At least that was my experience when I was there a couple years back. Perhaps it's different now.  My recommended chinese vpns are: