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Error 521 is not a client side issue. It means Cloudflare's server was unable to get a response from the origin server. The browser used would have no effect. I guess the answer is that the error happens "randomly" and that means there may be periods of time with a reduced frequency of errors...

I constantly get 521 errors when visiting my website. The site is a few minutes / moments online and then offline again.

Maybe the firewall issue was not the critical one, because I still get 521 errors often.

There is a requirement to log in to https://x10hosting.com/sso/login, not to your own website. I'm not sure if that's enough or we should also access DirectAdmin panel.

It's impossible to prevent or foresee everything. I used Notepad++ as a way to crosscheck the text I had copied, but it didn't work either, so trial and error is also another approach.

I copied from DA and pasted to Cloudflare and to Notepad++ independently. As I didn't see anything weird in Notepad++, I assumed that it would be the same for Cloudlfare, but judging from the result it certainly wasn't.

View > Show Symbol > Show All Characters That's what I enabled. I didn't see anything. The whole text was pasted in a single line and had to scroll horizontally to reach the end. Maybe, it wasn't something added, but something missing... Anyway, everything is fine now. Next time I will hit...

OK. That solved it. I copied it from the popup, after hitting edit and it worked! I'm not sure I can see any difference, since Notepad++ didn't reveal any special characters, when I copied the text directly from the webpage, but I guess that's not that important! Thanks for the support!

I selected and copied it without hitting the edit button. I will give it a try from the popup this time. (By the way, I also copied it to Notepad++, but it didn't show any non printable characters.)

I just added the trailing ";" in Cloudflare's TXT DKIM entry. No difference. My initial entry didn't have it, because I had copied it from x10hosting's DNS settings where there was no trailing ";", but as I said no difference.

Yes the "x._domainkey" are subdomains of my domain in Cloudflare's settings. Do you use quotation marks in your settings or not?

I just enabled it yesterday. I disabled it once in the meanwhile and then re-enabled it. I copied it once again now from x10hosting's DNS settings to Cloudflare's DNS settings. No luck. Gmail says FAIL for the DKIM. SPF works fine. Is it possible that this has to do with the MX entry, where I...

I don't receive the mails in spam folder, but when I check the original message SPF gives a PASS and DKIM a FAIL. I didn't see any suggestions specific to DKIM in the thread you mentioned, except if you mean Anna's recommendation about disabling proxying for POP and SMTP.

I have enabled DKIM for my domain. In Cloudflare I have the following DNS records A [domain].org 198.91.81.12 TXT [domain].org v=spf1 ip4:198.91.80.251 -all TXT x._domainkey v=DKIM1; k=rsa; p=[value] When I check in Gmail SPF leads to a...

Same here. Now I get 521 again. It resolves itself, but it comes back.

Same here. I just got Error 521 by server x12 using Cloudflare. I also have problems loading emails using Roundcube. edit: Things look back to normal for now. Website on x12 is now accessible.

Yes, things seem back to normal till the moment I'm writing this message.

Cloudflare gives me Error 522 for some time now.

You are right. I haven't. (Or maybe I had initially and had afterwards deleted the entry when I was trying to configure Mediawiki's SMTP.) I just did and everything works fine! Thanks!

Also sent an email from my Gmail account. Again no luck.