Error 523
Error 523 Origin Is Unreachable Error
What This Error Means
Error 523 occurs when Cloudflare cannot contact your origin web server. This is different from a timeout; it usually means the network path to the server is broken or the IP is incorrect.
Common Causes
- The DNS settings in Cloudflare point to the wrong IP address.
- Network routing issues between Cloudflare and the origin.
- The origin server is down or unreachable.
- Firewall rules blocking Cloudflare.
How to Fix It (For Users)
- 1 Wait for the site owner to fix the issue.
- 2 Try again later.
For Site Owners / Developers
- Double-check your DNS A records in Cloudflare.
- Contact your hosting provider to check for network outages.
- Ensure your firewall allows Cloudflare IPs.
- Verify your server's public IP hasn't changed.
When It Is NOT Your Fault
If there is a major internet routing issue.
Check if this outage affects everyone globally
This error often indicates a wider problem. Use our tool to verify if the site is down for everyone.
Check Website Status →Recommended Tool to Prevent This Error
Fix DNS resolution issues and protect your site from DDoS attacks with Cloudflare.