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Claude Code Issues / #26258

[BUG] Cowork Windows: API unreachable from VM + 12GB vm_bundle on never-working install (Win 11 Home, Intel Ultra 7)

Resolved 💬 4 comments Opened Feb 17, 2026 by thiarlesw Closed Mar 17, 2026

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 on Windows 11 Home. The Hyper-V micro-VM boots successfully and gets network connectivity, but cannot reach api.anthropic.com from inside the VM. Host machine connects to the API without issues. Regular Chat and Claude Code CLI work perfectly — only Cowork is affected.

Error message: "Não foi possível iniciar o espaço de trabalho do Claude - Não é possível acessar a API do Claude no workspace do Claude."

This is the same issue reported in #24918, #24962, #25241 — adding another Windows data point with detailed diagnostics.

Additional issue: The Cowork VM bundle (vm_bundles/claudevm.bundle) consumes ~12GB of disk space immediately after installation, even without ever successfully using Cowork. Related to #22543.

Environment

  • OS: Windows 11 Home Single Language (Build 10.0.26220)
  • CPU: Intel Core Ultra 7 155H
  • RAM: 15.5 GB
  • Claude Desktop Version: 1.1.2685
  • Commit Hash: f39a622da544d39d746a0aba120ee29d06b1bd28
  • Platform: win32 / x64
  • SDK Version: 2.1.34
  • Bundle Version: fc96f5bc6a7aeee6e651437eba3c76d0fe9a16f3

NAT Configuration (appears incomplete)

Get-NetNat: EMPTY (no NAT rules configured)
IP Forwarding: Disabled on vEthernet (cowork-vm-nat)
ICS (SharedAccess): Running

The VM gets general connectivity (SDK install succeeds in 4.5s) but cannot route HTTPS traffic to api.anthropic.com.

Network Adapters

| Name | Description | Status |
|------|-------------|--------|
| Wi-Fi | Intel Wi-Fi 6E AX211 160MHz | Up / Connected |
| Bluetooth | Bluetooth Device (PAN) | Disconnected |
| Kaspersky VPN | Kaspersky VPN adapter | Disconnected |
| vEthernet (cowork-vm-nat) | Hyper-V Virtual Ethernet Adapter | Up / Connected |

Host Network Test (all OK from host)

  • DNS Resolution: api.anthropic.com → 160.79.104.10
  • No VPN active
  • No proxy configured
  • TCP connection to api.anthropic.com:443: SUCCESS

Troubleshooting Steps Taken (all failed)

  1. Restarted Claude Desktop multiple times
  2. Restarted PC
  3. Added api.anthropic.com and *.anthropic.com to Kaspersky trusted domains
  4. Added Claude.exe as trusted application in Kaspersky with full traffic bypass
  5. Paused Kaspersky protection entirely — same result
  6. Fully uninstalled and reinstalled Claude Desktop — same result
  7. Verified host connectivity to api.anthropic.com — works fine
  8. Submitted support log via in-app feedback on Feb 11 — no response after 6 days

Disk Space Impact

The vm_bundles directory consumes 11.89 GB despite Cowork never successfully starting:

vm_bundles:  11.89 GB
claude-code:  0.22 GB
claude-code-vm: 0.21 GB
Total Claude AppData: 12.51 GB

Related Issues

  • #22543 — 10GB VM bundle, performance degradation (high-priority)
  • #24918 — API unreachable from VM (Windows 11 Home)
  • #24962 — Wrong DNS config, missing sessiondata.vhdx, no NAT
  • #25241 — API unreachable (Windows 11 Home)
  • #25206 — VM crashes within 5 minutes (Windows 11 Pro)

What Should Happen?

  • Cowork VM should successfully connect to api.anthropic.com
  • NAT rules should be properly configured (Get-NetNat should not be empty)
  • IP forwarding should be enabled on the virtual adapter
  • VM bundle should not consume 12GB when Cowork has never worked
  • Support should respond to detailed bug reports

Error Messages/Logs

2026-02-11 05:14:19 [info] [VM] Network status: NOT_CONNECTED
2026-02-11 05:14:20 [info] [VM] Network status: CONNECTED
2026-02-11 05:14:25 [info] [VM] API reachability: PROBABLY_UNREACHABLE
2026-02-11 05:14:53 [info] [VM] API reachability: UNREACHABLE
2026-02-11 05:14:53 [warn] [VM:network] API is unreachable

Steps to Reproduce

  1. Install Claude Desktop v1.1.2685 on Windows 11 Home
  2. Open Claude Desktop → Click "Cowork" tab
  3. Wait for VM to download and initialize
  4. VM boots, network shows CONNECTED
  5. API reachability check fails: PROBABLY_UNREACHABLE → UNREACHABLE

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.1.2685 (Claude Desktop)

Platform

Other

Operating System

Windows

Additional Information

_No response_

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