[BUG] Cowork VM connection timeout on Windows 11 Home ARM64 (Claude 1.2278.0.0)

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?

Cowork workspace fails to start with "VM connection timeout after 60 seconds" after updating to Claude 1.2278.0.0.

What Should Happen?

Can't start cowork after update

Error Messages/Logs

Bug Report: Cowork VM connection timeout on Windows 11 Home ARM64 (Claude 1.2278.0.0)

Device:

Lenovo 83HL, Snapdragon X / Qualcomm Oryon CPU (ARM64)
Windows 11 Home, Build 26200
Claude Desktop 1.2278.0.0
Problem:
Cowork workspace fails to start with "VM connection timeout after 60 seconds" after updating to Claude 1.2278.0.0.

Root cause (from logs):
The new smol-bin included in 1.2278.0.0 contains an updated daemon binary (ed411765). When the VM boots, the old daemon (bf2c13d3) detects the update, applies it, and then the new daemon (ed411765) crashes immediately — producing zero console output and never establishing its vsock connection to the host.

This results in a permanent 60-second timeout on every Cowork startup attempt.

Regression:
Cowork worked correctly in Claude 1.1.4498.0 (confirmed in logs from March 2026). The issue is specific to the new daemon binary shipped with 1.2278.0.0 on ARM64.

Relevant log files:

C:\ProgramData\Claude\Logs\cowork-service.log
C:\ProgramData\Claude\Logs\coworkd\user-S-1-5-21-3492074509-397282041-255339966-1001.log
C:\Users\jens\AppData\Roaming\Claude\logs\cowork_vm_node.log
Indsend via claude.ai/claude-code → Issues → eller direkte på GitHub: anthropics/claude-code

/debug



Debug-logging er nu aktiv. Log-filen er her:

C:\Users\jens\.claude\debug\30fb62ae-5a32-4304-ab59-f0a6e45fda5b.txt

Ingen log endnu — den oprettes når du reproducerer problemet.

Hvad vil du debug? Er det stadig Cowork VM-fejlen, eller er der noget med selve Claude Code-sessionen?

/Feedback


Unknown skill: Feedback


/feedback
Bug Report: Cowork VM connection timeout on Windows 11 Home ARM64 (Claude 1.2278.0.0)

Device:

Lenovo 83HL, Snapdragon X / Qualcomm Oryon CPU (ARM64)
Windows 11 Home, Build 26200
Claude Desktop 1.2278.0.0
Problem:
Cowork workspace fails to start with "VM connection timeout after 60 seconds" after updating to Claude 1.2278.0.0.

Root cause (from logs):
The new smol-bin included in 1.2278.0.0 contains an updated daemon binary (ed411765). When the VM boots, the old daemon (bf2c13d3) detects the update, applies it, and then the new daemon (ed411765) crashes immediately — producing zero console output and never establishing its vsock connection to the host.

This results in a permanent 60-second timeout on every Cowork startup attempt.

Regression:
Cowork worked correctly in Claude 1.1.4498.0 (confirmed in logs from March 2026). The issue is specific to the new daemon binary shipped with 1.2278.0.0 on ARM64.

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Unknown skill: feedback

Steps to Reproduce

Bug Report: Cowork VM connection timeout on Windows 11 Home ARM64 (Claude 1.2278.0.0)

Device:

Lenovo 83HL, Snapdragon X / Qualcomm Oryon CPU (ARM64)
Windows 11 Home, Build 26200
Claude Desktop 1.2278.0.0
Problem:
Cowork workspace fails to start with "VM connection timeout after 60 seconds" after updating to Claude 1.2278.0.0.

Root cause (from logs):
The new smol-bin included in 1.2278.0.0 contains an updated daemon binary (ed411765). When the VM boots, the old daemon (bf2c13d3) detects the update, applies it, and then the new daemon (ed411765) crashes immediately — producing zero console output and never establishing its vsock connection to the host.

This results in a permanent 60-second timeout on every Cowork startup attempt.

Regression:
Cowork worked correctly in Claude 1.1.4498.0 (confirmed in logs from March 2026). The issue is specific to the new daemon binary shipped with 1.2278.0.0 on ARM64.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

version before Claude Desktop 1.2278.0.0

Claude Code Version

Claude Desktop 1.2278.0.0

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_