Community Tip - Fixing Error: 503 Service Unavailable / Service Temporarily Unavailable

Error
Try the suggestions in this Community Tip to help you fix “Error 503: Service Unavailable” or “Error 503: Service Temporarily Unavailable”.

Background
An “Error 503: Service Unavailable” with no Cloudflare in the message means you need to contact your hosting provider for assistance. It generally means your host is rate limiting requests to your site or that I’m Under Attack Mode has been enabled on the domain.

A “Error 503: Service Temporarily Unavailable” with “Cloudflare” means you are hitting a connection limit in a Cloudflare data center. When this happens, please contact Cloudflare Customer Support. Include as many of the details mentioned in the Quick Fix Ideas as possible.

Rate limiting

Quick Fix Ideas

  1. When you post, please include your domain name & the time and timezone of the 503 error occurrence and check your host logs prior to posting.

  2. When you post here, please include a traceroute between your origin and one of Cloudflare’s IP addresses, ideally one of the addresses that usually sends requests to your site. See how to run a traceroute test.

  3. If you are seeing a traffic surge or attack against your site, when you post in the Community, let us know if you are seeing this in the error logs from your host.

  4. Disable Always Online if it is enabled.

Lite Reading
https://support.cloudflare.com/hc/en-us/articles/115003011431#503error

Background Resources
Help Center
YouTube

Research The Issue
Community
Google

Security Option
Rate Limiting protects against denial-of-service attacks, brute-force login attempts, and other types of abusive behavior targeting the application layer. Start Rate Limiting malicious traffic for free today.

If You Need More Help
This community of other Cloudflare users may be able to assist you, login to Cloudflare and post your question to the Community. When you post on the Community make sure to include as much of this information as possible: the specific error message you are seeing, the URLs this is happening on, screen shot of the error, and the steps to reproduce the error. Please indicate what troubleshooting steps you’ve tried in order to help us help you.

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