Won't let me connect to a realm I have payed for

Hey, I've payed for a realm and now that i connect to it i get this message: "internal exception java.io.ioexception an existing connection was forcibly closed by the remote host". Doesnt happen on any other server than on my realm, my friends who play on it have zero problems and i just get kicked 10-20 seconds after i join. I play on a pc with RTX 2080 super, so that shouldnt be a problem. I've tried flushing my routers DNS, I've also  tried to let Java acces my firewall, which wasnt so  succesfull.

My firewall usually looks like this:

I want it to look like this:

I mainly dont even think  this may be the problem, but I've looked at youtube videos and their tutorial doesnt work for me....

This is my last resort