UDP used to work (~3 years ago) but currently it's blocked wholesale. OpenVPN over TCP gets throttled and blocked thanks to DPI too, an obfuscation layer is required because OpenVPN traffic is identifiable due to a fairly unique encryption fingerprint.
Re:Why TCP Over TCP Is a Bad Idea (2001)
by rahimnathwani on Sunday March 29, 2015 @03:19AM
(#9284140)
Thanks. This is totally consistent with my experience, and it's good to know that it's not just me :)
What has been your experience with UDP over GFW?