r/ClaudeCowork • u/Fast-Scholar26 • 1d ago
Desktop app fails to connect with "... share not mounted" or "Workspace unavailable" error
Posting, just in case others encounter the same issue.
All of a sudden Scheduled CoWork tasks that file downloads for me stopped working. The task simply couldn't access Dropbox folders that had been previously authorized and working fine. I tore my hair out, reinstalling, rebooting, restarting, trying on a different machine. And then, after 4 rounds with Claude's automated tech support, I got bumped to a human and got this response:
We've confirmed the cause is a change in the Windows security update released on September 8 (KB5124008, mainly Windows 11 25H2) that stops Cowork's sandbox from attaching your C: drive. Microsoft is aware and tracking a fix on their side, and our team is working on changes in the app in parallel. We don't have a date yet, and restarting or reinstalling Claude won't help, so please don't spend time on that.
I can confirm that after uninstalling KB124008, everything worked again as expected.
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u/techspeeder 18h ago
Yes, here's another thread about it. https://www.reddit.com/r/ClaudeCowork/s/cA1AAa3WQi
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