Diagnose and resolve 5XX errors for Cloudflare proxied sites.

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Overview

When troubleshooting most 5XX errors, the correct course of action is to first contact your hosting provider or site administrator to troubleshoot and gather data.

Required error details to provide your hosting provider

Specific 5XX error code and message
Time and timezone the 5XX error occurred
URL that resulted in the HTTP 5XX error (for example: https://www.example.com/images/icons/image1.png)

Additional details to provide to your hosting provider or site administrator are listed within each error description below. Cloudflare Custom Error Pages change the appearance of default error pages discussed in this article.

Error analytics

Error Analytics per domain are available within the support portal for your account. Error Analytics allows insight into overall errors by HTTP error code and provides the URLs, responses, origin server IP addresses, and Cloudflare data centers needed to diagnose and resolve the issue. Error Analytics are based on a 1% traffic sample.

To view Error Analytics:

Navigate to the Cloudflare support portal. Refer to instructions about filing a support ticket for information on how to reach the support portal.
Scroll down to the Error Analytics section.
Click Visit Error Analytics.
Enter the domain to investigate.
A graph of Errors over time is displayed.
Click on a status code in the table beneath the graph to expand traffic error details.

Error 500: internal server error

Error 500 generally indicates an issue with your origin web server. Error establishing databaseconnection is a common HTTP 500 error message generated by your origin web server. Contact your hosting provider to resolve.

Resolution

Provide details to your hosting provider to assist troubleshooting the issue.

However, if the 500 error contains “cloudflare” or “cloudflare-nginx” in the HTML response body, provide Cloudflare support with the following information:

Your domain name
The time and timezone of the 500 error occurrence
The output of www.example.com/cdn-cgi/trace from the browser where the 500 error was observed (replace www.example.com with your actual domain and host name)

Error 502 bad gateway or error 504 gateway timeout

An HTTP 502 or 504 error occurs when Cloudflare is unable to establish contact with your origin web server.

There are two possible causes:

(Most common cause) 502/504 from your origin web server

502/504 from your origin web server

Cloudflare returns an Cloudflare-branded HTTP 502 or 504 error when your origin web server responds with a standard HTTP 502 bad gateway or 504 gateway timeout error:

Resolution

Contact your hosting provider to troubleshoot these common causes at your origin web server:

Ensure the origin server responds to requests for the hostname and domain within the visitor’s URL that generated the 502 or 504 error.
Investigate excessive server loads, crashes, or network failures.
Identify applications or services that timed out or were blocked.

502/504 from Cloudflare

A 502 or 504 error originating from Cloudflare appears as follows:

If the error does not mention “cloudflare,” contact your hosting provider for assistance on 502/504 errors from your origin.

Resolution

To avoid delays processing your inquiry, provide these required details to Cloudflare Support:

Time and timezone the issue occurred.
URL that resulted in the HTTP 502 or 504 response (for example: https://www.example.com/images/icons/image1.png)
Output from browsing to www.example.com/cdn-cgi/trace (replace www.example.com with the domain and host name that caused the HTTP 502 or 504 error)

Error 503: service temporarily unavailable

HTTP error 503 occurs when your origin web server is overloaded. There are two possible causes discernible by error message:

Error doesn’t contain “cloudflare” or “cloudflare-nginx” in the HTML response body.

Resolution: Contact your hosting provider to verify if they rate limit requests to your origin web server.

Error contains “cloudflare” or “cloudflare-nginx” in the HTML response body.

Resolution: A connectivity issue occured in a Cloudflare data center. Provide Cloudflare support with the following information:

Your domain name
The time and timezone of the 503 error occurrence
The output of www.example.com/cdn-cgi/trace from the browser where the 503 error was observed (replace www.example.com with your actual domain and host name)

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

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 32 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

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-request-id or 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.

Error 521: web server is down

Error 521 occurs when the origin web server refuses connections from Cloudflare. Security solutions at your origin may block legitimate connections from certain Cloudflare IP addresses.

The two most common causes of 521 errors are:

Offlined origin web server application
Blocked Cloudflare requests

Resolution

Contact your site administrator or hosting provider to eliminate these common causes:

Ensure your origin web server is responsive
Review origin web server error logs to identify web server application crashes or outages.
Confirm Cloudflare IP addresses are not blocked or rate limited
Allow all Cloudflare IP ranges in your origin web server'

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