When I've been in China I had to:
disable the DHT and local peer discovery in order to avoid getting probed by the GFW disable uTP and restort to the traditional TCP-based transportIn the past, people rewrote the window size (by interception) to a smaller, randomly chosen value.
The GFW regexp(s) did not recognize the torrent traffic.
But now the fw seems to do stream reassembly, so this is not effective.
I asked some friends in China…
It doesn't seem gaytorrent is actually the subject of dns poisoning, nor ip blocking.
But the topology of the GFW is not homogenous, so it's difficult to be really sure.
If this is the case you may try to tunnel the connection to the tracker. (shadowsock, psiphon, tor, lantern, streisand, ...)
In my case, a VPN wasn't an option.. The connection for high-bandwith streams isn't stable in mainland since VPNs are banned.