When it goes green it’s just Plex testing the connection. If it falls back to red it was never really working
Use this to test the port you opened. If it fails that means something is still blocking you
Common problems are vpn’s, firewalls, anti-virus or some type of security features in the router itself
Your ISP may also be at fault by not allowing you to do this. More and more are
These guides will help you trouble shoot
https://support.plex.tv/articles/200931138-troubleshooting-remote-access/
