Slack outage on December 5, 2025
Slack users likely saw failed connections, degraded availability, or session instability for this Productivity service. The incident reached Major severity and lasted 45 min. The stored report window does not show a preserved user-report spike.
Between 2:08 PM PST and 2:34 PM PST on December 4, 2025, some users may have experienced 500 errors when trying to open a Canvas. Current status and recent actions taken: We have resolved the issue by reverting a web cache configuration setting that was causing the disruption. Users should no longer be experiencing trouble connecting to or loading Canvases in Slack.Scope: This issue did not affect any specific region, but a percentage of users may have been impacted globally.Previous impact to end users: Users experienced issues loading and accessing Canvases.Required resolution steps: No
Deterministic readout · awaiting AI summary pass
Incident detected
Major confidence crossed the incident threshold for Incident: Slack Canvas Outage.
Marked resolved
The incident was closed after 45 min of observed impact.
No per-source signal payloads were preserved in this incident's snapshot window.
Confidence scoring
80.00The incident reached 80.00 peak confidence across available stored status snapshots.
User reports
0 / 15mNo elevated user-report volume was preserved in the incident window snapshots.
Status samples
0 affectedThe incident row exists, but the bounded snapshot window does not include affected status samples.
Recovery signal
ResolvedRecovery was recorded at Fri, Dec 05, 2025, 12:47 AM UTC.