Theoretically GFW can do that, because SSH handshake has fingerprints that can be identified. But it will irritate every administrator on this world.
From a reliable source I heard they only ban SSH/VPN service if they can get a free account for testing. So if you are going to use SSH/VPN, make sure the provider do not serve free trials.
From a reliable source I heard they only ban SSH/VPN service if they can get a free account for testing. So if you are going to use SSH/VPN, make sure the provider do not serve free trials.