Paper 1.17.1 ( 279 ) connection refused

I know it probably isn’t a paper issue, but this is the only place I could ask and get a reply. My paper server has been port-forwarded to both of my routers, I allowed it through my firewall, and I am still getting connection refused or connection timed out. Any suggestions would mean the world to me as I have been trying to make a 1.17.1 server after making a 1.16.5 for a short time at the beginning of the year.