I am trying to implement a Socks5 client in C#, everything is working fine, I implemented all of the required auth methods.
It worked fine with a local Socks5 proxy, but then I tried to connect to a public server and it wanted to auth using a method with the number 0x84, which is in the range of private methods (X'80' to X'FE' RESERVED FOR PRIVATE METHODS).
Then I tried a few other servers and they all wanted this method.
Now I am wondering where I can find the specifications for this, since I was unable to find them.
Turns out that the public socks server was running version 4 and not, as advertised version 5. And i had a bug in making shure the version is equal to 5.