Cloudfare for some odd reason keeps throwing 521 errors in when I use this website called Nexus. For some odd reason, even when I “wait a few minutes” like it tells me to, it doesn’t want to work. Outagedown says it’s online, but Cloudfare says it isn’t, and in the troubleshooting guide the only solution for the 521 error is “contact your internet service provider”, which just leaves me in utter confusion and makes me distrust this service. Obviously I don’t own the website nor do I use this service, but I was left with questions left unanswered.
Does the error change when you switch from “Full SSL” to “Flexible SSL”?
What happens when you deactivate Cloudflare? - make the “gray” clouds instad of “orange”
Who is your hosting provider? Maybe there is some blocking requests from origin to Cloudflare?