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Methods to Repair Error 521 with WordPress and Cloudflare

•Error 521 could also be a Cloudflare-specific error message (like error 520) that appears as soon as your WordPress website’s server refuses a reference to Cloudflare.

What’s Error 521 web Server is Down?

•As you realized greater than, the Error 521 message is a slip-up message that’s particular to Cloudflare.

•Basically, it means your browser was able to with success hook up with Cloudflare, nonetheless Cloudflare wasn’t able to hook up with the origin web server – AKA your WordPress website’s server.

•Particularly, Cloudflare tried to connect to your WordPress website’s server nonetheless obtained a connection refused error in response.

•As a result of Cloudflare can’t hook up along with your web site, it’s unable to point out your web site to friends and reveals the Error 521 message as an alternative:

•An instance of the Error 521 message

What Causes the Error 521 Message?

•Usually, the Error 521 message is brought on by one among 2 conditions:

•First, your WordPress website’s server can also be down. regardless that every thing else is designed correctly, in case your WordPress website’s server is offline, Cloudflare merely gained’t be prepared to attach.

•Second, your web server could possibly be working advantageous nonetheless obstruction Cloudflare’s requests for a number of motive. on account of nonetheless Cloudflare works, some server-side safety options might unknowingly block Cloudflare’s data processing addresses.

•As a result of Cloudflare is a reverse proxy, all the visitors returning to your origin server can appear as if it’s getting back from alittle fluctuate of Cloudflare data processings (fairly than each particular person customer’s distinctive IP handle). As such, some safety options can learn excessive visitors from a restricted vary of knowledge processing addresses as affiliate diploma assault and block them.

•When that occurs, Cloudflare gained’t be prepared to attach and might present the Error 521 message as an alternative.

Methods to Repair Error 521 for Cloudflare and WordPress

👉Now that you just perceive what’s occurring, let’s perforate a solution to repair Error 521 in WordPress.

Step 1: check out if the Origin Server is on-line

•Earlier than going any more, you’ll want to type constructive that your WordPress website’s server is on-line and functioning generally. If it’s not, there’s no sense creating by elimination into further troubleshooting steps.

•To check this, you will run a cURL command. If you happen to’re on waterproof coat or Linux, you will run this proper from Terminal.

•Home windows doesn’t have cURL put in by default and, whereas you will set up it, a simpler technique is to make use of KeyCDN’s 

•All you might be doing is plug in http://1.2.3.4, the place 1.2.3.4 is that the precise data processing handle of your server.

•The KeyCDN Header Test instrument

•If you happen to host at tech2wires, you will discover your server data processing handle within the Websites tab:

•The place to go looking out your tech2wires server data processing handle

•Or, you will moreover take it from the A report on your area within the DNS space of the Cloudflare web dashboard.

•In case your server is up, you could see an HTTP 200 response. Or, in case you host at tech2wires, you’ll see 404 Not Discovered, that moreover signifies that the online server is up (there’s merely no web page associated to that IP):

•An instance of a roaring affiliation

•If there’s a retardant, you’ll see one factor like Host Not Discovered or Failed to attach:

•An instance of a retardant alongside along with your server

•If there’s a retardant alongside along with your server and also you’re undecided what’s occurring, attain intent in your host’s help

Step 2: Whitelist all Cloudflare data processing ranges in your server’s firewall

•In case your WordPress web site’s server is functioning generally nonetheless you proceed to see the Error 521 message after you try and entry your website, future step is to whitelist all of Cloudflare’s data processing ranges to type constructive that your server isn’t obstruction them.

•Right here’s a full record of Cloudflare’s data processing ranges.

•You’ll want to type constructive you aren’t obstruction these data processing addresses in .htaccess, iptables, or your firewall. And also you’ll moreover want to type constructive that your internet hosting provider isn’t charge limiting or obstruction data processing requests from Cloudflare’s data processing addresses.

•If you happen to’re undecided a method to do this, attain intent in your host’s help. At tech2wires, these data processing ranges should already be whitelisted.

Step 3: ponder lots of particular issues

•Lastly, right here space unit some lots of particular technical steps you will take, counting in your server’s configuration.

1) If you happen to solely began mistreatment Cloudflare’s HTTPS, your origin server is probably not designed to allow Cloudflare’s data processing addresses to entry port 443. If you happen to can’t put collectively your firewall to allow this, try utilizing Versatile SSL as an alternative of Full SSL at Cloudflare.

2) Make constructive you’re mistreatment the foremost latest variations of Dangerous Conduct or mod_security, if relevant.

3) If you happen to’re mistreatment the mod_antiloris or mod_reqtimeout Apache modules, disable and unload these modules.