Cloudflare Error 523
Critical
Origin is unreachable
Cloudflare cannot find the origin at the network layer. This typically means incorrect DNS records or the origin route is unreachable.
Impact: Website completely inaccessible
Responsibility
Configuration
This error is usually caused by incorrect DNS, SSL, or firewall configurations.
Common Causes
- The origin IP configured in Cloudflare DNS is incorrect or no longer exists
- A private IP (e.g., 10.x.x.x) was accidentally configured in public DNS
Troubleshooting Guide
1
Verify Origin IP
Log into the Cloudflare Dashboard and check your DNS settings. Ensure the A or AAAA records point to your valid, public origin IP.