Local Server does not allow people to join

I followed all the instructions in setting up a multiplayer server, including editing firewall, setting up Port Forwarding, and everything else I see listed in what to do.

When I launch the server in Direct Connect, I had no issues running it. But nobody can join it.

I check the cmd and when my friend tries to join, it instantly says “failed to connect” but my cmd screen doesn’t show any error or activity whatsoever.

Spend a whole day troubleshooting and watching videos and resetting, etc. Not sure what to do.

Am I missing anything? Any help is greatly appreciated.

It appears that your server is not reachable, maybe a mistake when port forwarding. Try https://portchecker.co/

any idea how to port forward for Spectrum internet? Guess its not working.