Hi there (surely) great PunBB community!
I'm using CloudFlare on my website and it helps me a lot! It really boosted up my website and protected it. The thing is that CloudFlare changes users' IPs. There are various plugins for many CMS (such as Wordpress, PHPBB, XenoForums...) to decode that IP back to normal...
I used CloudFlare on my website. And I run PunBB 1.4.2 in a subfolder of the main domain. By some reason after 2-3 days CloudFlare starts to display page "This website is offline" after minor changes to some users (oftrn after *.php chages).
It looks for me like CloudFlare is sensitive to the files change.
I am not a guru in ClodFlare services and I was not able to get it sorted out. That's why I was forced to disable CloudFlare services on my website.
So any advise to make CloudFlare compiant with PunBB would be greatly appreciated.