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Incident affecting Hosting

Firebase Hosting custom domains API returning 501 errors

Incident began at 2026-07-30 14:00 (all times are US/Pacific).

Date Time Description
30 Jul 2026 22:14 PDT

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.
30 Jul 2026 21:38 PDT

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.
30 Jul 2026 20:38 PDT

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.