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Common Errors

These are our most common error pages and how to handle them.

Error 520

Error 520: Unknown error

There is an unknown connection issue between CloudFlare and the origin web server.

Error 521

Error 521: Web server is down

The web server is not returning a connection.

Error 522

Error 522: Connection timed out

The initial connection between CloudFlare's network and the origin web server timed out.

Error 523

Error 523: Origin is unreachable

The web origin server is not reachable. Learn how to fix it now.

Error 524

Error 524: Timeout

The origin web server timed out responding to this request.

Bad Gateway

Bad Gateway

There is an issue with the CloudFlare network. Report it to us here.

DNS 1004: Host not configured

DNS 1004

If you just enabled CloudFlare, wait five minutes and then try another browser to see if this error disappears. Learn more here.

Apache error


This is not a CloudFlare-related error. Please contact your hosting provider to resolve this problem.

SSL error

SSL Error

If you have SSL on your site, you need an SSL certificate through CloudFlare's provider, or you can upload your own SSL certificate. Learn more here.

Common Questions

These are common questions our customers ask and how to address them.

Announcements and Frequently Asked Questions


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Top Frequently Asked Questions

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Knowledge Base

Getting Started

Free Universal SSL

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CloudFlare DDoS Protection

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CloudFlare Error Messages

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Billing & Account Management

Keyless SSL

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Rocket Loader: Asynchronous JavaScript Loading

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Using CloudFlare with forum software and platforms

SPDY: Make web pages faster and decrease latency

Auto Minify: Minify JavaScript, CSS and HTML

Railgun: Dynamic content acceleration and compression

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CloudFlare's CDN (Content Delivery Network)

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Always Online

IPv4/IPv6 Gateway

CloudFlare and WordPress

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Mirage and Polish: Mobile Image Optimization and Compression

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Business and Enterprise Sales

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Hosting Partner Inquiries

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CloudFlare Apps

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Managing your CloudFlare Account

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CloudFlare Performance Features

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CloudFlare Security Features

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Managing DNS Records

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Troubleshooting CloudFlare Problems

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Reporting (Threat Control and Analytics)

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SSL at CloudFlare

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How do I restore original visitor IP to my server logs?

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CloudFlare API

Abuse and DMCA

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How to change DNS at your registrar to CloudFlare's nameservers

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CloudFlare's Web Application Firewall (WAF)

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Page Rules

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Project Galileo

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