Firebase incident

Firebase Hosting custom domains API returning 501 errors

Major Resolved

Firebase experienced a major incident on July 30, 2026 affecting Hosting and Hosting (global), lasting 13h 20m. The incident has been resolved; the full update timeline is below.

Started
Jul 30, 2026, 09:00 PM UTC
Resolved
Jul 31, 2026, 10:20 AM UTC
Duration
13h 20m
Detected by Pingoru
Jul 30, 2026, 09:00 PM UTC

Affected components

HostingHosting (global)

Update timeline

  1. investigating Jul 31, 2026, 03:38 AM UTC

    The engineering team is investigating elevated 501 "unimplemented" errors seen in Hosting's API when managing custom domains. It does not appear at this time that the data plane is effected.

  2. investigating Jul 31, 2026, 04:38 AM UTC

    We believe to have found the root cause and are working to restore this portion of our API. We are more confident now that the data plane is unaffected and that this was limited in scope to the management of Hosting custom domains.

  3. investigating Jul 31, 2026, 05:14 AM UTC

    The fix is being rolled out. The ETA for complete resolution is July 31 at ~11:00 UTC, though some users may have restored functionality before then.