Degraded functionality for Claude Cowork on Windows
This issue has been resolved. Microsoft has released a September 14 Windows update that fixes it: https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5129195-windows-11-24h2-25h2-security-update
The latest update from Anthropic.
State
Resolved
Started
52 d ago
2026-09-10 15:54 UTC
Lasted
4 days
until 2026-09-14 19:14 UTC
Worst impact
Partial outage
Timeline
2 updatesIdentified
4 days 100%
Updates
Times in UTCAs posted by Anthropic
This issue has been resolved. Microsoft has released a September 14 Windows update that fixes it: https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5129195-windows-11-24h2-25h2-security-update
A Windows update released September 8 has left Claude Cowork on Windows unable to run local commands, because its workspace can no longer reach your computer's drive. For most users, chat and file reading and editing still work. There's no in-app workaround yet, and restarting or reinstalling won't help. Microsoft has developed a fix and is working to release it. We'll post an update when we have more to share.
Affected components
1Anthropic in the last 90 days
Full historyIncidents in 90 days
50
Days with an incident
42
Median duration
1 h 8 min
This incident
88× the median
Other Anthropic incidents
All incidentsAnthropic·Elevated errors affecting the Google Calendar connector
The issue affecting the Google Calendar connector on claude.ai, Claude Code, and Claude Cowork has been resolved. Impact occurred from 04:07 PT / 11:07 UTC on October 26 to 11:52 PT / 18:52 UTC on October 28.
Anthropic·Elevated errors affecting the Gmail connector
The issue affecting the Gmail connector on claude.ai, Claude Code, and Claude Cowork has been resolved. Impact occurred from 16:00 PT / 23:00 UTC on October 27 to 22:29 PT on October 27 / 05:29 UTC on October 28.
Anthropic·Elevated errors for Claude Sonnet 5.5
The issue affecting claude.ai, the Claude API, Claude Code, and Claude Cowork has been resolved. Impact occurred from 07:42 PT / 14:42 UTC to 08:17 PT / 15:17 UTC.
Anthropic·Elevated errors for Claude Sonnet 5.5
The issue affecting Claude services has been resolved.
Anthropic·Elevated errors for Claude Fable 5.1
The issue affecting Claude services has been resolved. Impact occurred from 01:08 PT / 08:08 UTC to 01:29 PT / 08:29 UTC.
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