### Preflight Checklist - [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) 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? I was using Cowork fine on Claude Desktop but suddenly yesterday I get this error message (VM service not running) and nothing i do (reinstalling claude d

[BUG] Failed to start Claude's workspace VM service not running. The service failed to start.

Resolved 💬 8 comments Opened Mar 7, 2026 by sinajahn Closed Apr 20, 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?

I was using Cowork fine on Claude Desktop but suddenly yesterday I get this error message (VM service not running) and nothing i do (reinstalling claude desktop etc) is working.
Claude Desktop v1.1.5368, Windows 11 Pro
Hyper-V enabled, vmms and vmcompute both Running
CoworkVMService starts but crashes within seconds
Error: "Connection closed before response"
NAT rule manually created, VM bundle deleted and rebuilt — same result
What Should Happen?

Claude Cowork should be functional
Error Messages/Logs

026-03-03 10:23:19 [info] [KernelBugMonitor] State reset
2026-03-03 10:23:19 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-03 10:23:19 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-03 10:23:19 [info] [VM:start] VM instance ID: f6dcebeb-b25e-4b59-bb5d-a88af0bf7a2c
2026-03-03 10:23:19 [info] [VM:steps] download_and_sdk_prepare started
2026-03-03 10:23:19 [info] [VM:steps] download_and_sdk_prepare completed (6ms)
2026-03-03 10:23:19 [info] [VM:steps] load_swift_api started
2026-03-03 10:23:19 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-03 10:23:19 [info] [Callbacks] Initializing VM event callbacks...
2026-03-03 10:23:19 [info] [Callbacks] VM event callbacks initialized
2026-03-03 10:23:19 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-03 10:23:19 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-03 10:23:19 [info] [VM:start] Configuring Windows VM service...
2026-03-03 10:23:19 [info] [KernelBugMonitor] State reset
2026-03-03 10:23:19 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-03 10:23:19 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-03 10:23:19 [info] [VM:start] VM instance ID: f6dcebeb-b25e-4b59-bb5d-a88af0bf7a2c
2026-03-03 10:23:19 [info] [VM:steps] download_and_sdk_prepare started
2026-03-03 10:23:19 [info] [VM:steps] download_and_sdk_prepare completed (5ms)
2026-03-03 10:23:19 [info] [VM:steps] load_swift_api started
2026-03-03 10:23:19 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-03 10:23:19 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-03 10:23:19 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-03 10:23:19 [info] [VM:start] Configuring Windows VM service...
2026-03-03 10:23:20 [info] [VM:start] Windows VM service configured
2026-03-03 10:23:20 [info] [VM:start] Windows VM service configured
2026-03-03 10:23:22 [error] [VM:start] VM boot failed: VM is already running
2026-03-03 10:23:22 [info] Dispatching startup error: VM is already running
2026-03-03 10:23:22 [error] [VM:start] Startup failed: Error: VM is already running
    at e4t (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:722:3894)
    at async Object.startVM (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:1328:17218)
    at async C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:7:229334
    at async Session.<anonymous> (node:electron/js2c/browser_init:2:116443) {
  [stack]: [Getter/Setter],
  [message]: 'VM is already running'
}
2026-03-03 10:23:22 [info] [VM:start] Auto-reinstalling workspace after startup failure
2026-03-03 10:23:22 [info] [deleteVMBundle] Deleting reinstall files from C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-03 10:23:22 [info] [deleteVMBundle] Reinstall files deleted (sessiondata.img and rootfs.img.zst preserved)
2026-03-03 10:23:22 [info] [VM:shutdown] App quit, stopping VM (instance: f6dcebeb-b25e-4b59-bb5d-a88af0bf7a2c)...
2026-03-03 10:23:24 [info] [VM:shutdown] Completed in 1865ms
2026-03-03 10:23:27 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-03 10:23:27 [info] [VM] Module loaded successfully
2026-03-03 10:23:31 [info] [KernelBugMonitor] State reset
2026-03-03 10:23:31 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-03 10:23:31 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-03 10:23:31 [info] [VM:start] VM instance ID: 4d936725-a857-4d7a-b410-1d62744753cd
2026-03-03 10:23:31 [info] [VM:steps] download_and_sdk_prepare started
2026-03-03 10:23:31 [info] [VM:steps] download_and_sdk_prepare completed (4ms)
2026-03-03 10:23:31 [info] [VM:steps] load_swift_api started
2026-03-03 10:23:31 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-03 10:23:31 [info] [Callbacks] Initializing VM event callbacks...
2026-03-03 10:23:31 [info] [Callbacks] VM event callbacks initialized
2026-03-03 10:23:31 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-03 10:23:31 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-03 10:23:31 [info] [VM:start] Configuring Windows VM service...
2026-03-03 10:23:32 [info] [KernelBugMonitor] State reset
2026-03-03 10:23:32 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-03 10:23:32 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-03 10:23:32 [info] [VM:start] VM instance ID: 4d936725-a857-4d7a-b410-1d62744753cd
2026-03-03 10:23:32 [info] [VM:steps] download_and_sdk_prepare started
2026-03-03 10:23:32 [info] [VM:steps] download_and_sdk_prepare completed (4ms)
2026-03-03 10:23:32 [info] [VM:steps] load_swift_api started
2026-03-03 10:23:32 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-03 10:23:32 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-03 10:23:32 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-03 10:23:32 [info] [VM:start] Configuring Windows VM service...
2026-03-03 10:23:32 [info] [VM:start] Windows VM service configured
2026-03-03 10:23:33 [info] [VM:start] Windows VM service configured
2026-03-03 10:23:33 [error] [VM:start] VM boot failed: VM is already running
2026-03-03 10:23:33 [info] Dispatching startup error: VM is already running
2026-03-03 10:23:33 [error] [VM:start] Startup failed: Error: VM is already running
    at e4t (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:722:3894)
    at async Object.startVM (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:1328:17218)
    at async C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:7:229334
    at async Session.<anonymous> (node:electron/js2c/browser_init:2:116443) {
  [stack]: [Getter/Setter],
  [message]: 'VM is already running'
}
2026-03-03 10:23:33 [info] [VM:start] Skipping auto-reinstall (already attempted once)
2026-03-03 10:23:36 [info] [KernelBugMonitor] State reset
2026-03-03 10:23:36 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-03 10:23:36 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-03 10:23:36 [info] [VM:start] VM instance ID: 4d936725-a857-4d7a-b410-1d62744753cd
2026-03-03 10:23:36 [info] [VM:steps] download_and_sdk_prepare started
2026-03-03 10:23:36 [info] [VM:steps] download_and_sdk_prepare completed (5ms)
2026-03-03 10:23:36 [info] [VM:steps] load_swift_api started
2026-03-03 10:23:36 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-03 10:23:36 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-03 10:23:36 [error] [VM:start] Startup failed: Error: EBUSY: resource busy or locked, copyfile 'C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx' -> 'C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx'
    at async Object.copyFile (node:internal/fs/promises:619:10)
    at async e4t (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:722:3162)
    at async Object.startVM (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:1328:17218)
    at async C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:7:229334
    at async Session.<anonymous> (node:electron/js2c/browser_init:2:116443) {
  [stack]: [Getter/Setter],
  [message]: "EBUSY: resource busy or locked, copyfile 'C:\\Program Files\\WindowsApps\\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\\app\\resources\\smol-bin.x64.vhdx' -> 'C:\\Users\\sina.farzaneh\\AppData\\Roaming\\Claude\\vm_bundles\\claudevm.bundle\\smol-bin.vhdx'",
  errno: -4082,
  code: 'EBUSY',
  syscall: 'copyfile',
  path: 'C:\\Program Files\\WindowsApps\\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\\app\\resources\\smol-bin.x64.vhdx',
  dest: 'C:\\Users\\sina.farzaneh\\AppData\\Roaming\\Claude\\vm_bundles\\claudevm.bundle\\smol-bin.vhdx'
}
2026-03-03 10:23:36 [info] [VM:start] Skipping auto-reinstall (already attempted once)
2026-03-03 10:23:43 [info] [VM] Network status: CONNECTED
2026-03-03 10:23:44 [error] [VM:start] Startup failed: Error: Connection closed before response
    at Socket.<anonymous> (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:20244)
    at Socket.emit (node:events:508:28)
    at Pipe.<anonymous> (node:net:346:12) {
  [stack]: [Getter/Setter],
  [message]: 'Connection closed before response'
}
2026-03-03 10:23:44 [info] [VM:start] Skipping auto-reinstall (already attempted once)
2026-03-03 10:24:03 [info] [VM:shutdown] App quit, stopping VM (instance: 4d936725-a857-4d7a-b410-1d62744753cd)...
2026-03-03 10:24:08 [error] [VM:shutdown] Failed: Error: VM service not running. The service failed to start.
    at Ra (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:20539)
    at process.processTicksAndRejections (node:internal/process/task_queues:103:5)
    at async Object.stopVM (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:22251)
    at async Object.fn (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:722:2083)
    at async C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:16767
    at async Promise.allSettled (index 11)
    at async llt (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:16647) {
  [stack]: [Getter/Setter],
  [message]: 'VM service not running. The service failed to start.'
}
2026-03-03 10:24:09 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-03 10:24:09 [info] [VM] Module loaded successfully
2026-03-04 08:24:34 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-04 08:24:34 [info] [VM] Module loaded successfully
2026-03-04 08:25:41 [info] [KernelBugMonitor] State reset
2026-03-04 08:25:41 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-04 08:25:41 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-04 08:25:41 [info] [VM:start] VM instance ID: 175758f4-7bfb-4ad9-baa9-915bbe2572c4
2026-03-04 08:25:41 [info] [VM:steps] download_and_sdk_prepare started
2026-03-04 08:25:41 [info] [VM:steps] download_and_sdk_prepare completed (21ms)
2026-03-04 08:25:41 [info] [VM:steps] load_swift_api started
2026-03-04 08:25:41 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-04 08:25:41 [info] [Callbacks] Initializing VM event callbacks...
2026-03-04 08:25:41 [info] [Callbacks] VM event callbacks initialized
2026-03-04 08:25:41 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-04 08:25:41 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-04 08:25:41 [info] [VM:start] Configuring Windows VM service...
2026-03-04 08:25:42 [info] [VM:start] Windows VM service configured
2026-03-04 08:25:42 [info] [startVM] VM startup already in progress, waiting...
2026-03-04 08:25:53 [info] [VM:start] Still waiting for guest connection... 10064ms elapsed, 8 polls
2026-03-04 08:25:55 [error] [VM:start] Startup failed: Error: Connection closed before response
    at Socket.<anonymous> (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:20244)
    at Socket.emit (node:events:508:28)
    at Pipe.<anonymous> (node:net:346:12) {
  [stack]: [Getter/Setter],
  [message]: 'Connection closed before response'
}
2026-03-04 08:25:55 [info] [VM:start] Skipping auto-reinstall (already attempted once)
2026-03-04 08:26:48 [info] [stopVM] stopping VM gracefully
2026-03-04 08:26:53 [info] [deleteVMBundle] Deleting reinstall files from C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-04 08:26:53 [info] [deleteVMBundle] Reinstall files deleted (sessiondata.img and rootfs.img.zst preserved)
2026-03-04 08:26:53 [info] [VM:shutdown] App quit, stopping VM (instance: 175758f4-7bfb-4ad9-baa9-915bbe2572c4)...
2026-03-04 08:26:58 [error] [VM:shutdown] Failed: Error: VM service not running. The service failed to start.
    at Ra (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:20539)
    at process.processTicksAndRejections (node:internal/process/task_queues:103:5)
    at async Object.stopVM (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:22251)
    at async Object.fn (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:722:2083)
    at async C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:16767
    at async Promise.allSettled (index 11)
    at async llt (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:16647) {
  [stack]: [Getter/Setter],
  [message]: 'VM service not running. The service failed to start.'
}
2026-03-04 08:27:01 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-04 08:27:01 [info] [VM] Module loaded successfully
2026-03-04 21:39:03 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-04 21:39:03 [info] [VM] Module loaded successfully
2026-03-04 21:39:07 [info] [KernelBugMonitor] State reset
2026-03-04 21:39:07 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-04 21:39:07 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-04 21:39:07 [info] [VM:start] VM instance ID: fdcd3ef2-a6f4-4f5f-b357-a635a979133d
2026-03-04 21:39:07 [info] [VM:steps] download_and_sdk_prepare started
2026-03-04 21:39:07 [info] [VM:steps] download_and_sdk_prepare completed (7ms)
2026-03-04 21:39:07 [info] [VM:steps] load_swift_api started
2026-03-04 21:39:07 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-04 21:39:07 [info] [Callbacks] Initializing VM event callbacks...
2026-03-04 21:39:07 [info] [Callbacks] VM event callbacks initialized
2026-03-04 21:39:07 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-04 21:39:07 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-04 21:39:07 [info] [VM:start] Configuring Windows VM service...
2026-03-04 21:39:08 [info] [KernelBugMonitor] State reset
2026-03-04 21:39:08 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-04 21:39:08 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-04 21:39:08 [info] [VM:start] VM instance ID: fdcd3ef2-a6f4-4f5f-b357-a635a979133d
2026-03-04 21:39:08 [info] [VM:steps] download_and_sdk_prepare started
2026-03-04 21:39:08 [info] [VM:steps] download_and_sdk_prepare completed (6ms)
2026-03-04 21:39:08 [info] [VM:steps] load_swift_api started
2026-03-04 21:39:08 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-04 21:39:08 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-04 21:39:08 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-04 21:39:08 [info] [VM:start] Configuring Windows VM service...
2026-03-04 21:39:08 [info] [VM:start] Windows VM service configured
2026-03-04 21:39:08 [info] [VM:start] Windows VM service configured
2026-03-04 21:39:09 [error] [VM:start] VM boot failed: VM is already running
2026-03-04 21:39:09 [info] Dispatching startup error: VM is already running
2026-03-04 21:39:09 [error] [VM:start] Startup failed: Error: VM is already running
    at e4t (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:722:3894)
    at async Object.startVM (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:1328:17218)
    at async C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:7:229334
    at async Session.<anonymous> (node:electron/js2c/browser_init:2:116443) {
  [stack]: [Getter/Setter],
  [message]: 'VM is already running'
}
2026-03-04 21:39:09 [info] [VM:start] Skipping auto-reinstall (already attempted once)
2026-03-04 21:39:15 [error] [VM:start] Startup failed: Error: Connection closed before response
    at Socket.<anonymous> (C:\Program Files\WindowsApps\Claude_1.1.4498.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:20244)
    at Socket.emit (node:events:508:28)
    at Pipe.<anonymous> (node:net:346:12) {
  [stack]: [Getter/Setter],
  [message]: 'Connection closed before response'
}
2026-03-04 21:39:15 [info] [VM:start] Skipping auto-reinstall (already attempted once)
2026-03-05 12:44:40 [info] [warm] Fetching VM hash for version 1.1.5368
2026-03-05 12:44:40 [info] [warm] VM hash for version 1.1.5368: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-05 12:44:40 [info] [warm] VM SHA matches current version, skipping
2026-03-06 12:15:27 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-06 12:15:27 [info] [VM] Module loaded successfully
2026-03-06 12:15:30 [info] [KernelBugMonitor] State reset
2026-03-06 12:15:30 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-06 12:15:30 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-06 12:15:30 [info] [VM:start] VM instance ID: e39b4a09-8bd3-4d18-b788-1f6d68cf5d19
2026-03-06 12:15:30 [info] [VM:steps] download_and_sdk_prepare started
2026-03-06 12:15:31 [info] [KernelBugMonitor] State reset
2026-03-06 12:15:31 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-06 12:15:31 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-06 12:15:31 [info] [VM:start] VM instance ID: e39b4a09-8bd3-4d18-b788-1f6d68cf5d19
2026-03-06 12:15:31 [info] [VM:steps] download_and_sdk_prepare started
2026-03-06 12:16:06 [info] [VM:steps] download_and_sdk_prepare completed (34981ms)
2026-03-06 12:16:06 [info] [VM:steps] load_swift_api started
2026-03-06 12:16:06 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-06 12:16:06 [info] [Callbacks] Initializing VM event callbacks...
2026-03-06 12:16:06 [info] [Callbacks] VM event callbacks initialized
2026-03-06 12:16:06 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-06 12:16:06 [info] [VM:steps] download_and_sdk_prepare completed (35487ms)
2026-03-06 12:16:06 [info] [VM:steps] load_swift_api started
2026-03-06 12:16:06 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-06 12:16:06 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-06 12:16:06 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-06 12:16:06 [info] [VM:start] Configuring Windows VM service...
2026-03-06 12:16:06 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-06 12:16:06 [info] [VM:start] Configuring Windows VM service...
2026-03-06 12:16:07 [info] [VM:start] Windows VM service configured
2026-03-06 12:16:07 [info] [VM:start] Windows VM service configured
2026-03-06 12:16:10 [error] [VM:start] VM boot failed: VM is already running
2026-03-06 12:16:10 [info] Dispatching startup error: VM is already running
2026-03-06 12:16:10 [error] [VM:start] Startup failed: Error: VM is already running
    at bLt (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:794:3948)
    at async Object.ALt [as ensureReady] (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:795:954)
    at async YLe.prepare (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:784:10917)
    at async C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:784:11123
    at async YLe.withMutex (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:784:25395)
    at async b3t (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:1254:12837)
    at async Object.addMarketplace (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:1254:20816)
    at async C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:7:271591
    at async Session.<anonymous> (node:electron/js2c/browser_init:2:116443) {
  [stack]: [Getter/Setter],
  [message]: 'VM is already running'
}
2026-03-06 12:16:10 [info] [VM:start] Skipping auto-reinstall (already attempted once)
2026-03-06 12:16:19 [info] [VM] Network status: CONNECTED
2026-03-06 12:16:19 [info] [VM:steps] sdk_install started
2026-03-06 12:16:19 [info] [VM:start] Installing SDK: subpath=AppData/Local/Packages/Claude_pzs8sxrjxfjjc/LocalCache/Roaming/Claude/claude-code-vm, version=2.1.63
2026-03-06 12:16:19 [error] [VM:start] Startup failed: Error: Connection closed before response
    at Socket.<anonymous> (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:20374)
    at Socket.emit (node:events:508:28)
    at Pipe.<anonymous> (node:net:346:12) {
  [stack]: [Getter/Setter],
  [message]: 'Connection closed before response'
}
2026-03-06 12:16:19 [info] [VM:start] Skipping auto-reinstall (already attempted once)
2026-03-06 12:17:31 [info] [stopVM] stopping VM gracefully
2026-03-06 12:17:36 [info] [deleteVMBundle] Deleting reinstall files from C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-06 12:17:36 [info] [deleteVMBundle] Reinstall files deleted (sessiondata.img and rootfs.img.zst preserved)
2026-03-06 12:17:36 [info] [VM:shutdown] App quit, stopping VM (instance: e39b4a09-8bd3-4d18-b788-1f6d68cf5d19)...
2026-03-06 12:17:41 [error] [VM:shutdown] Failed: Error: VM service not running. The service failed to start.
    at Ra (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:20669)
    at process.processTicksAndRejections (node:internal/process/task_queues:103:5)
    at async Object.stopVM (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:22381)
    at async Object.fn (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:794:2083)
    at async C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:16897
    at async Promise.allSettled (index 11)
    at async Klt (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:16777) {
  [stack]: [Getter/Setter],
  [message]: 'VM service not running. The service failed to start.'
}
2026-03-06 12:17:43 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-06 12:17:43 [info] [VM] Module loaded successfully
2026-03-06 12:18:07 [info] [stopVM] stopping VM gracefully
2026-03-06 12:18:12 [info] [deleteVMBundle] Deleting reinstall files from C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-06 12:18:12 [info] [deleteVMBundle] Reinstall files deleted (sessiondata.img and rootfs.img.zst preserved)
2026-03-06 12:18:14 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-06 12:18:14 [info] [VM] Module loaded successfully
2026-03-06 19:56:00 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-06 19:56:00 [info] [VM] Module loaded successfully
2026-03-06 19:56:01 [info] [KernelBugMonitor] State reset
2026-03-06 19:56:01 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-06 19:56:01 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-06 19:56:01 [info] [VM:start] VM instance ID: 33272d68-847e-4e0c-9912-025b70caaa5a
2026-03-06 19:56:01 [info] [VM:steps] download_and_sdk_prepare started
2026-03-06 19:56:01 [info] [VM:steps] download_and_sdk_prepare completed (5ms)
2026-03-06 19:56:01 [info] [VM:steps] load_swift_api started
2026-03-06 19:56:01 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-06 19:56:01 [info] [Callbacks] Initializing VM event callbacks...
2026-03-06 19:56:01 [info] [Callbacks] VM event callbacks initialized
2026-03-06 19:56:01 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-06 19:56:01 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-06 19:56:01 [info] [VM:start] Configuring Windows VM service...
2026-03-06 19:56:01 [info] [VM:start] Windows VM service configured
2026-03-06 19:56:08 [error] [VM:start] Startup failed: Error: Connection closed before response
    at Socket.<anonymous> (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:20374)
    at Socket.emit (node:events:508:28)
    at Pipe.<anonymous> (node:net:346:12) {
  [stack]: [Getter/Setter],
  [message]: 'Connection closed before response'
}
2026-03-06 19:56:08 [info] [VM:start] Skipping auto-reinstall (already attempted once)
2026-03-06 20:02:42 [info] [KernelBugMonitor] State reset
2026-03-06 20:02:42 [info] [VM:start] Beginning startup, bundlePath=C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-06 20:02:42 [info] [VM:start] Bundle version: fb30784dadb34104626c8cf6d8f90dd47cd393cc
2026-03-06 20:02:42 [info] [VM:start] VM instance ID: 33272d68-847e-4e0c-9912-025b70caaa5a
2026-03-06 20:02:42 [info] [VM:steps] download_and_sdk_prepare started
2026-03-06 20:02:42 [info] [VM:steps] download_and_sdk_prepare completed (2ms)
2026-03-06 20:02:42 [info] [VM:steps] load_swift_api started
2026-03-06 20:02:42 [info] [VM:steps] load_swift_api completed (0ms)
2026-03-06 20:02:42 [info] [VM:start] Copying smol-bin.x64.vhdx to bundle: C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\smol-bin.x64.vhdx -> C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle\smol-bin.vhdx
2026-03-06 20:02:43 [info] [VM:start] smol-bin.x64.vhdx copied successfully
2026-03-06 20:02:43 [info] [VM:start] Configuring Windows VM service...
2026-03-06 20:02:44 [info] [VM:start] Windows VM service configured
2026-03-06 20:02:50 [error] [VM:start] Startup failed: Error: Connection closed before response
    at Socket.<anonymous> (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:20374)
    at Socket.emit (node:events:508:28)
    at Pipe.<anonymous> (node:net:346:12) {
  [stack]: [Getter/Setter],
  [message]: 'Connection closed before response'
}
2026-03-06 20:02:50 [info] [VM:start] Skipping auto-reinstall (already attempted once)
2026-03-06 20:02:57 [info] [stopVM] stopping VM gracefully
2026-03-06 20:03:02 [info] [deleteVMBundle] Deleting reinstall files from C:\Users\sina.farzaneh\AppData\Roaming\Claude\vm_bundles\claudevm.bundle
2026-03-06 20:03:02 [info] [deleteVMBundle] Reinstall files deleted (sessiondata.img and rootfs.img.zst preserved)
2026-03-06 20:03:02 [info] [VM:shutdown] App quit, stopping VM (instance: 33272d68-847e-4e0c-9912-025b70caaa5a)...
2026-03-06 20:03:07 [error] [VM:shutdown] Failed: Error: VM service not running. The service failed to start.
    at Ra (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:20669)
    at process.processTicksAndRejections (node:internal/process/task_queues:103:5)
    at async Object.stopVM (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:22381)
    at async Object.fn (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:794:2083)
    at async C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:16897
    at async Promise.allSettled (index 11)
    at async Klt (C:\Program Files\WindowsApps\Claude_1.1.5368.0_x64__pzs8sxrjxfjjc\app\resources\app.asar\.vite\build\index.js:171:16777) {
  [stack]: [Getter/Setter],
  [message]: 'VM service not running. The service failed to start.'
}
2026-03-06 20:03:10 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-06 20:03:10 [info] [VM] Module loaded successfully
2026-03-06 20:08:47 [info] [VM] Loading vmClient (TypeScript) module...
2026-03-06 20:08:47 [info] [VM] Module loaded successfully
2026-03-06 20:08:52 [info] [Bundle:status] rootfs.vhdx missing
2026-03-06 20:08:52 [info] [Bundle:status] rootfs.vhdx missing
2026-03-06 20:08:52 [info] [Bundle:status] rootfs.vhdx missing
2026-03-06 20:08:52 [info] [warm] No warm file found for rootfs.vhdx at current version
2026-03-06 20:08:52 [info] [cache] No cached compressed file for rootfs.vhdx
2026-03-06 20:08:52 [info] rootfs.vhdx not found, downloading...
2026-03-06 20:08:52 [info] Downloading rootfs.vhdx...
Steps to Reproduce

Install Claude Desktop v1.1.5368 on Windows 11 Pro
Enable Hyper-V (Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V-All, reboot)
Confirm Hyper-V services running (vmms and vmcompute both Running)
Open Claude Desktop, switch to Cowork
Error: "Failed to start Claude's workspace — VM service not running. The service failed to start."
CoworkVMService starts briefly then crashes with "Connection closed before response"
Manually creating NAT rule (New-NetNat -Name "cowork-vm-nat" -InternalIPInterfaceAddressPrefix "172.16.0.0/24") did not resolve
Deleting vm_bundles to force fresh rebuild did not resolve
Removing and recreating the VM via Get-VM / Remove-VM did not resolve
Issue persists across reboots
Claude Model

Not sure / Multiple models
Is this a regression?

Yes, this worked in a previous version
Last Working Version

_No response_
Claude Code Version

Claude 1.1.5368 (d12d02) 2026-03-05T17:29:33.000Z
Platform

Anthropic API
Operating System

Windows
Terminal/Shell

PowerShell
Additional Information

_No response_
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