The Kodi Forum server is moving datacenter this weekend, none of the links to the Kodi Forum in my blog post will work during this time.
Strange that you get to Cloudflare error page rather than an explanation of what is happening.
UPDATE (2 Oct): There is now a message, they are doing maintenance so should be back up soon.
UPDATE (4 Oct): Server is still not back, from the sound of it the hosting company is not that good and definitely one to avoid.
UPDATE (6 Oct 12:00): Server still down.
UPDATE (6 Oct 20:00): Forum server is back with a new theme.
Check if the forum is back up here
Please bookmark blog pages and try links later.