can`t entry in realms or server

Whenever i try to entry a server or realm, my minecraft gives me error 500 and i cant log in, but when i can afther some seconds or minutes the game kickme out with a java error "internal exeption: java.io.IOExeption: an existing connection was forcibly to close by a remote host".
I have already tried uninstalling and reinstalling minecraft and java, didn`t work, check if java as permission to go above the firewall, didn`t work as well, tried resarting the computer and the router, nothing, tried to flush my dns, didn`t work as well, tried running versions like 1.12,1.12.1,1.12.2 (read that that could fix the problem in the minecraft forum), didn`t work.
I tried all of that e i still can`t run realms or server, so idk what to do, btw i`m connected via wifi