Since it sounds like this is your home router since you mentioned you use Comcast. If you are testing the site from within your network using your external ip then you are possibly running into a loop back block. Comcast does not allow traffic that originates from within your network back into your network.
Try the ip/site from a Hotspot and that might work.
100% agree with this.
It is so much faster for me to give the ai the api/library documentation than it would be for me to figure out how that api works. Is it a perfect drop-in, finished piece of code? No. But that is not what I ask the ai for. I ask it for a simple example which I can then take, modify, and rework into my own code.