HTTP/3 issue affecting R2 custom domains

Incident Report for Cloudflare

Resolved

This incident has been resolved.
Posted Sep 03, 2026 - 19:32 UTC

Monitoring

A fix has been implemented and we are monitoring the results.
Posted Sep 03, 2026 - 15:14 UTC

Identified

The issue has been identified and a fix is being implemented.
Posted Sep 01, 2026 - 14:46 UTC

Investigating

Some Firefox users may see delayed or failed asset loads on R2 custom domains due to an incorrect HTTP/3 advertisement. We are working on a fix.
Posted Aug 31, 2026 - 18:47 UTC
This incident affected: Cloudflare Sites and Services (R2).
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