Page could not be loaded

[rdn]

I just had this happen to me as well, really surprised me. No ad/content blockers, SSL certificate is fine.

Does your site also on Cloudflare?
It happens sometimes here on XF because Cloudflare DNS is down sometimes.

 

[DeltaHF]

Does your site also on Cloudflare?
It happens sometimes here on XF because Cloudflare DNS is down sometimes.

Yes, it is! Interesting.

 

[rdn]

Cloudflare is congested and overloaded, so quick downtime happens almost everyday :/.
I haven't experience this kind of error on my XF site not using CF.

 

[karlgray]

Just a quick tip. If you are using plesk check the /etc/nginx/nginx.conf file for this;
worker_processes 1;

The default value for this is auto and plesk overrides this to limit the number of worker processes.

I am beating myself up for missing this obvious cause, and am making my shame for missing it public.

Why, oh why did plesk think this was a smart idea?

My advice. Set this value to either auto OR if you have high DB/php load to a value half that of the number of cores in your CPU and adjust from there.