Well how I bypassed my schools own network was by creating an own app which redirected the connections to the offical silkraod servers.
Btw hunkuk that's probably not what's going on almost every school. port 80 which is for http and port 443 which is for https aren't blocked most of the other ports are blocked but normally the internet of schools are just for internet and nothing else.
So what I did was connecting to my own apps which I have running at a server at my house which accepted connections at port 80 and 443 so 80 for the login server and 443 for the gameserver and tada I could login and play arround
But i'm not going to share the program cause it's not fully working and I have to make a lot of changes every time cause it doesn't support other servers like the downloader server and it only connects to server xian.
But i'm sure that there are some free to use apps which also do the trick