I am not sure what changed, but for years I was able to host a minecraft server on the port 25565, but now I am unable to open any ports to any services. My current setup is a Motorola SURFboard SBG6580 modem/router acting as a modem, and a Netgear nighthawk R6700v2 router. I have checked my firewall permissions and created permissions for inbound and outbound rules for the port 25565 as well as inbound outbound permissions for Java. I even put my SURFBoard modem/router into the DMZ by setting the DMZ to the routers IP address, and even then the IP is blocked. I have called my ISP Charter Spectrum and they have claimed that they do not block the ports I have been trying to open. I have also run the server on a different computer on the same internet and the port has remained closed. I even plugged in my desktop directly into the modem and the ports are still closed. I have quadruple checked that my IPs are correct, I have browsed multiple forums and tried multiple guides, and I am at a loss as what to do to fix this issue.