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95% of customer questions can be solved through the information available in our Knowledge Base.
New to CloudFlare and wondering where to start? Check out the Getting Started section!

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

Apache

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

Announcements

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Top Frequently Asked Questions

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Knowledge Base

Billing & Account Management

CloudFlare's CDN (Content Delivery Network)

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IPv4/IPv6 Gateway

Project Galileo

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Getting Started

CloudFlare 101

Troubleshooting

Restoring Visitor IPs

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General Troubleshooting

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Error Pages

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Billing & Account Management

Account Management

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Billing

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DNS

General

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SSL

General

See all 78 articles

Keyless SSL

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Firewall

General

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Advanced DDoS Protection

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Web Application Firewall

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Speed

General

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Railgun

See all 9 articles

SPDY

Caching

Always Online

Page Rules

General

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Analytics

General

See all 22 articles

Third-Party Software

Content Management System (CMS)

See all 17 articles

Forum Software

Enterprise Documentation

General

Hosting Partners

General

See all 35 articles

CloudFlare Client API

General

CloudFlare Apps

General

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Abuse & DMCA

General

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