HetrixTools incident

Increased error rate for websites behind Cloudflare

Notice Resolved View vendor source →

HetrixTools experienced a notice incident on March 18, 2026 affecting Uptime Monitoring, lasting 2h 53m. The incident has been resolved; the full update timeline is below.

Started
Mar 18, 2026, 12:20 PM UTC
Resolved
Mar 18, 2026, 03:14 PM UTC
Duration
2h 53m
Detected by Pingoru
Mar 18, 2026, 12:20 PM UTC

Affected components

Uptime Monitoring

Update timeline

  1. identified Mar 18, 2026, 12:20 PM UTC

    We've been observing an increased rate of 520 HTTP errors from HEAD requests to websites behind Cloudflare. Cloudflare has recently acknowledged the issue on their end and is working on a fix: https://www.cloudflarestatus.com/incidents/kxvggpg7kwx5 In the meantime, you can fix the issue right away in your HetrixTools account by changing the "HTP Method" from "HEAD" to "GET" for any of your website monitors (by editing the monitor's settings): https://docs.hetrixtools.com/wp-content/uploads/2022/10/image.png You can check if you're affected by this Cloudflare issue by checking your Location Fail Log (https://docs.hetrixtools.com/location-fail-log/) and looking for 520 HTTP errors.

  2. resolved Mar 18, 2026, 03:14 PM UTC

    Cloudflare has updated the status of their incident to resolved. We're noticing that the number of 520 HTTP errors from HEAD requests has gone down. This incident is now resolved.