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claude-code - 💡(How to fix) Fix [BUG] Cowork VM guest connection timeout on Windows ARM64 (Snapdragon X Plus, Galaxy Book4 Edge) [1 comments, 2 participants]

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anthropics/claude-code#46048•Fetched 2026-04-11 06:30:20
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anderliveryanderlivery
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anderliveryanderliverygithub-actions[bot]github-actions[bot]
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Error Message

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

Root Cause

Related issues

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

Code Example

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
RAW_BUFFERClick to expand / collapse

Preflight Checklist

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

What's Wrong?

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report
  • 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" />

extent analysis

TL;DR

The issue can be resolved by investigating and addressing the connection timeout between the host and guest VM, potentially related to the add_plan9_shares step.

Guidance

  • Investigate the add_plan9_shares step to ensure it is completing successfully and not causing the connection timeout.
  • Verify the network configuration and connectivity between the host and guest VM.
  • Check for any known issues or limitations with running Cowork VM on Windows ARM64 (Snapdragon X Plus) devices.
  • Consider increasing the connection timeout value to see if it resolves the issue.

Example

No code snippet is provided as the issue seems to be related to the VM connection and configuration.

Notes

The issue may be specific to the Samsung Galaxy Book4 Edge (Snapdragon X Plus) device or the Windows ARM64 platform. Further investigation is needed to determine the root cause.

Recommendation

Apply workaround: Increase the connection timeout value to see if it resolves the issue, as the current timeout of 60 seconds may be too low for the guest VM to establish a connection.

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