[BUG] Cowork VM guest connection timeout on Windows ARM64 (Snapdragon X Plus, Galaxy Book4 Edge)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report
• [x] I am using the latest version of Claude Code

What's Wrong?

Cowork VM boots successfully but the guest never establishes a connection back to the host. Times out after 60 seconds every time.

Device

• Device: Samsung Galaxy Book4 Edge (Snapdragon X Plus)
• OS: Windows 11, ARM64
• Claude Desktop: v1.1617.0.0 (ARM64)

What I've tried

• VirtualMachinePlatform is enabled
• vmcompute and CoworkVMService both running
• smol-bin.arm64.vhdx copies successfully
• Deleted vm_bundles folder and let Claude re-download fresh — same result
• Multiple reboots and restarts

Log (cowork_vm_node.log)

VM boots in ~158ms, completes all steps through add_plan9_shares, then waits 60s for guest connection and times out:
[VM:steps] vm_boot completed (158ms)
[VM:steps] add_plan9_shares completed (3ms)
[VM:start] Still waiting for guest connection... 10297ms elapsed
...
[error] [VM:start] Connection timeout, last completed step: add_plan9_shares

Related issues

• #45549 (vhdx not copied — different root cause, mine copies fine)
• #40198 (same symptom on Galaxy Book4 Edge)

What Should Happen?

Cowork VM should boot and establish guest connection successfully on Windows ARM64 (Snapdragon X Plus).

Error Messages/Logs

2026-04-09 22:48:24 [info] [VM:steps] vm_boot completed (158ms)
2026-04-09 22:48:24 [info] [VM:steps] add_plan9_shares completed (3ms)
2026-04-09 22:48:34 [info] [VM:start] Still waiting for guest connection... 10297ms elapsed, 21 polls
2026-04-09 22:48:44 [info] [VM:start] Still waiting for guest connection... 20554ms elapsed, 41 polls
2026-04-09 22:48:55 [info] [VM:start] Still waiting for guest connection... 30800ms elapsed, 61 polls
2026-04-09 22:49:05 [info] [VM:start] Still waiting for guest connection... 41038ms elapsed, 81 polls
2026-04-09 22:49:15 [info] [VM:start] Still waiting for guest connection... 51295ms elapsed, 101 polls
2026-04-09 22:49:24 [error] [VM:start] Connection timeout, last completed step: add_plan9_shares
2026-04-09 22:49:24 [error] [VM:start] Startup failed: Error: VM connection timeout after 60 seconds

Steps to Reproduce

1. Install Claude Desktop ARM64 (v1.1617.0.0) on Windows 11 ARM64 (Snapdragon X Plus)
2. Open Claude Desktop and switch to Cowork tab
3. Enter any task
4. VM boots but guest never connects — timeout after 60 seconds

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.1617.0.0

Platform

Other

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

<img width="897" height="635" alt="Image" src="https://github.com/user-attachments/assets/a893f773-657e-4ab1-b242-e63017a70b0e" />