Server Connection Issues

Connecting to a server I frequent on, have never had issues with connection. Now after a minute or two of being on I get this error:

internal exception: java.io.ioexception: an existing connection was forcibly closed by remote host

I already tested by deleting and re-installing the game. I don't run the the .exe but the .jar for my launcher. Issue still persists with fresh install. Have also restarted my computer and router. I also made sure java was allowed through my firewall.

My internet connection is 50 Mbps down, 10 up, wireless. I know my java is up-to-date and I have Windows 10 64-bit.