Plex Not Working After Fresh Install

[MrRobot]

I have freshly installed Quickbox on Ubuntu 16.04, install goes thorough fine and I have turned my quota off to use all available disk(s).

After installing Plex, then trying to launch the page, it jsut shows a blank white page trying to load. I have removed Plex and reinstalled, I have even wiped my install of Quickbox and freshly installed Ubuntu to no avail.

I have tried searching through the forums but people have different issues and the one that looks like it could help, the link shows oops this page is no longer available

Update 2
Accessing it via the IP and not domain, it looks as if it will loads, asks me to login to my Plex account, then just shows the same servers I have access to and not my new ‘Quickbox’ server?

I have also turned my firewall off on the dedicated server (Hertzner)
Any help would be gratefully appreciated

Just to add it looks like anything with a port number I have the same issue

[late]

you have to use a ssh tunnel to access plex over the local network to do your initial setup, after that it will work as normal. there is a guide here in the wiki: https://quickbox.io/knowledgebase/setting-up-an-ssh-tunnel-for-plex/

[MrRobot]

Thank you for that, I can confirm it works now (using the external IP) not my domain name. Do you have any idea why this could be ?

[late]

there are some extra settings required to get plex on a domain name. I personally setup the cloudflare cdn, from the guide also in the wiki: https://quickbox.io/knowledgebase/set-up-a-cdn-for-plex-with-cloudflare-nginx/