After installing CSF firewall, unable to resolve host, panel dead, doesn't load. Hostname?

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I’m guessing that if we change the port from 8090 to 8443 we have to make sure 8443 is allowed in the CSF firewall config. I guess we have to SSH into our server and edit the CSF config manually to allow port 8443? Is it TCP in and out?

There are a few other threads discussing Cloudflare and Cyberpanel, but none seem to cover the issues I ran into. IE: Cloudflare and Cyberpanel CP