Firebase incident

404 error for Firebase Cloud Messaging clients sending to a URL with a trailing slash

Major Resolved

Firebase experienced a major incident on March 17, 2026 affecting Cloud Messaging and Cloud Messaging (global), lasting 7h 10m. The incident has been resolved; the full update timeline is below.

Started
Mar 17, 2026, 07:00 AM UTC
Resolved
Mar 17, 2026, 02:10 PM UTC
Duration
7h 10m
Detected by Pingoru
Mar 17, 2026, 07:00 AM UTC

Affected components

Cloud MessagingCloud Messaging (global)

Update timeline

  1. investigating Mar 20, 2026, 01:05 PM UTC

    A recent change is causing 404 errors for clients who send messages to a URL which includes a trailing slash (/v1/projects/my-project/messages:send/ vs /v1/projects/my-project/messages:send). We are in the process of rolling back this change. For clients that are impacted, removing the trailing slash from the send URL will immediately resolve the problem.

  2. resolved Mar 20, 2026, 02:40 PM UTC

    The rollback is complete - service is fully restored.