Connection issues with reamsl

I am an owner of a Minecraft Java realm and I am having sever connection issues. I am unable to maintain connection to realm for even a few seconds before I am kicked and receive the error message "internal exception: java.io.IOException: an existing connection was forcibly closed by the remote host" I have searched numerous FAQs and other submitted tickets with this issue, I have done every step I have encountered and still have issues remaining connected. I have uninstalled/reinstalled Java and Minecraft itself, I have modified firewall settings and even removed my firewall entirely, still no connection, I have reset my Internet service and have tried different wifi connections as well as using an ethernet cable. I have restarted my PC countless times after each step. How can I fix this so I can continue using my realm subscription?