I would suggest not to follow that tutorial. For some reason the tutorial clones NodeBB under /var/www which is not required.
Also you will end up using the master branch of NodeBB which is a development version and is likely to have bugs.
Whenever I try to access this community from PC, it redirects to NodeBB.org . Please check.
@meetdilip doesn't happens to me. Could be that CloudFlare fucked up again as it happened to me once.
Its been like that for me since a month now.
@meetdilip you ever tried using a different browser?
Also do you use any DNS servers on your PC?
I tried only with Firefox. I use Google DNS.
Just tried. Working fine on Vivaldi browser for Ubuntu.