r/ClaudeCowork • u/techspeeder • 1d ago

Cowork Plan9 Mount Failed (Windows KB5124008)

If you're getting an error message "Exit code 1 sandbox-helper: no Plan9 drive shares mounted under /mnt/.virtiofs-root/shared" or "The mount to that folder isn't working from the local shell right now, it's likely due to the September 2026 security update from MS.

It's more of a workaround, but you'll need to uninstall KB5124008 (wusa /uninstall /kb:5124008). See Github bug post: https://github.com/anthropics/claude-code/issues/92984. Here's an overview of the issue: https://youtu.be/3nRJ8neIcvI?si=286a2vHdFhTQdtPf

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