So the bungee cord exploit with force op still working ? i tried like today bur i need a proxy to connect to a server , so idk what to say.
I think you don't understand how bungeecord servers work. I will explain it below.
You have 1 server which is the bungeecord server. You do not use this server to play minecraft on. This server is essentially the proxy server.
For example.
Your IP: 111.11.111.1
Bungeecord server IP: 222.22.222.2
Hub server IP: 333.33.333.3
When you connect to mc.domain.com, you are connecting to the bungeecord server. The bungeecord server authenticates you (to see if your username and password are correct). It essentially puts you onto their proxy.
When you spawn, its because the bungeecord server says, push this user into the hub server (which is an actual minecraft server where you can play on). So it will usually push you onto the hub server (which is a place you can play minecraft on).
The Hub doesn't see your IP of 111.11.111.1. It see's your IP as 222.22.222.2 which is the bungeecord IP because as said above, you are now on a proxy. Of course there are still ways for the Hub to see your real IP, but that's besides the point.
To exploit bungeecord, you would be directly to connect to the Hub using the IP 333.33.333.3 because the hub is in offline mode (which means it doesn't authenticate you). Hence, you can use cracked launchers and make your username whatever you want. However, the issue is that, most owners know this, so they make sure if you connect to the hub, your IP is 222.22.222.2, not something else.
So when you get a proxy error, thats why. Unless you know how to spoof your IP, you can't really do anything. I'm sure there are other checks it makes too. I never tried to hack into a server this way
gunot