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[Peasgood]

Error 520: web server returns an unknown error

Error 520 occurs when the origin server returns an empty, unknown, or unexpected response to Cloudflare.

Resolution

 

A quick workaround while further investigating 520 errors is to either make the record DNS-only in the Cloudflare DNS app or temporarily pause Cloudflare.

 

Contact your hosting provider or site administrator and request a review of your origin web server error logs for crashes and to check for these common causes:

• Origin web server application crashes
• Cloudflare IPs not allowed at your origin
• Headers exceeding 16 KB (typically due to too many cookies)
• An empty response from the origin web server that lacks an HTTP status code or response body
• Missing response headers or origin web server not returning proper HTTP error responses.
  • upstream prematurely closed connection while reading response header from upstream is a common error we may notice in our logs. This indicates the origin web server was having issues which caused Cloudflare to generate 520 errors.

 

520 errors are prevalent with certain PHP applications that crash the origin web server.

 

If 520 errors continue after contacting your hosting provider or site administrator, provide the following information to Cloudflare Support:

• Full URL(s) of the resource requested when the error occurred
• Cloudflare cf-ray from the 520 error message
• Output from http://www.example.com/cdn-cgi/trace (replace www.example.com with your hostname and domain where the 520 error occurred)
• Two HAR files:
  • one with Cloudflare enabled on your website, and
  • the other with Cloudflare temporarily disabled.

[Doug Tait]

Much worse this morning. Can someone get The Boss a strong coffee, he maybe got a bit woozy after the England win and pressed a wrong button.

[Steve Bullman]

So the problem is with Cloudflare which is out of my control. A fix is expected today though as a lot of websites are apparently affected.

[petercb]

5 hours ago, Steve Bullman said:

So the problem is with Cloudflare which is out of my control. A fix is expected today though as a lot of websites are apparently affected.

Been having this problem on a number of websites for a while now.

[daveatdave]

last 2 days not signing in first time it says unknown server error i just refresh the page and then it seems to work as normal 

[daveatdave]

it took 2 attempts to post the above 

[Steve Bullman]

We seem to be out of the other end finally

[Stubby]

12 minutes ago, Steve Bullman said:

We seem to be out of the other end finally

PHEW ! 🙂

[topchippyles]

23 minutes ago, Steve Bullman said:

We seem to be out of the other end finally

About time steve is it a personal issue causing these problems there is help available sir 🤣

Dear Deidre - your personal problems solved 

Edited December 6, 2022 by topchippyles

[Dan Maynard]

10 hours ago, Steve Bullman said:

We seem to be out of the other end finally

Yes thanks, been just fine this afternoon.