HTTP 520 Web Server Returned an Unknown Error vs 530 Site Frozen
Both HTTP 520 (Web Server Returned an Unknown Error) and 530 (Site Frozen) belong to the 5xx Server Error category. 520 indicates that cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process. Meanwhile, 530 means that cloudflare-specific. Used by Pantheon hosting to indicate a frozen site.
Description
Cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
When You See It
When Cloudflare receives an empty, unknown, or malformed response from the origin.
How to Fix
Check origin server logs. Ensure responses include proper headers. Verify SSL configuration.
Description
Cloudflare-specific. Used by Pantheon hosting to indicate a frozen site.
When You See It
When a site on Pantheon hosting has been frozen due to inactivity.
How to Fix
Reactivate the site on the hosting platform.
Key Differences
HTTP 520: Cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
HTTP 530: Cloudflare-specific. Used by Pantheon hosting to indicate a frozen site.
You encounter 520 when when Cloudflare receives an empty, unknown, or malformed response from the origin.
You encounter 530 when when a site on Pantheon hosting has been frozen due to inactivity.
When to Use Which
For 520 (Web Server Returned an Unknown Error): Check origin server logs. Ensure responses include proper headers. Verify SSL configuration. For 530 (Site Frozen): Reactivate the site on the hosting platform.