I used to run AC servers on my old PC all the time, and just tried to set one up on the new PC, and I can't get it to connect. Yes, I've opened/forwarded all the same ports in my router. Yes, I've created passthrough rules in Windows Firewall. I've even tried disabling Windows Firewall completely. I've rebooted both the router and Windows multiple times. I still get the dreaded error message telling me to check the port forwarding that I just verified is correct a hundred times. I'm beginning to wonder if the fabric of reality is unwinding around me. This worked flawlessly before.