Starting ComfyUI server... -> Unable to start ComfyUI Desktop - Comfy v0.8.4

Desktop Feedback Windows
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Hi, when starting ComfyUI and connecting to the server, the application stops working. I’m trying the Comfy version for AMD rx 6700 xt. Can you please advise me? Comfy v0.8.4

2 Likes
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Same issue here on a M4 Mac

1 Like
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I’m having the same issue as well. I’m running RX 6900 XT. Here are the error lines I see in my logs

[2026-02-17 16:09:15.526] [info] Created extra_model_paths.yaml at C:\Users\Victo\AppData\Roaming\ComfyUI\extra_models_config.yaml
[2026-02-17 16:09:15.526] [error] Log rotation: cannot access log dir C:\Users\Victo\AppData\Roaming\ComfyUI\logs\comfyui.log
[2026-02-17 16:09:15.527] [info] Running command: C:\Users\Victo\Documents\ComfyUI.venv\Scripts\python.exe D:\Program Files\ComfyUI\resources\ComfyUI\main.py --user-directory C:\Users\Victo\Documents\ComfyUI\user --input-directory C:\Users\Victo\Documents\ComfyUI\input --output-directory C:\Users\Victo\Documents\ComfyUI\output --front-end-root D:\Program Files\ComfyUI\resources\ComfyUI\web_custom_versions\desktop_app --base-directory C:\Users\Victo\Documents\ComfyUI --database-url sqlite:///C:/Users/Victo/Documents/ComfyUI/user/comfyui.db --extra-model-paths-config C:\Users\Victo\AppData\Roaming\ComfyUI\extra_models_config.yaml --log-stdout --listen 127.0.0.1 --port 8000 --enable-manager in C:\Users\Victo\Documents\ComfyUI
[2026-02-17 16:09:39.011] [error] Python process exited with code 3221225477 and signal null
[2026-02-17 16:09:39.016] [error] Unhandled exception during server start Error: Python process exited with code 3221225477 and signal null
at ChildProcess. (D:\Program Files\ComfyUI\resources\app.asar.vite\build\main.cjs:38760:18)
at ChildProcess.emit (node:events:519:28)
at ChildProcess._handle.onexit (node:internal/child_process:294:12)
[2026-02-17 16:09:45.511] [error] @todesktop/runtime: alwaysResolve: Promise timed out after 30000ms
[2026-02-17 16:09:45.780] [info] @todesktop/runtime: Checking for update

[2026-02-17 16:14:18.921] [error] Python process exited with code 3221225477 and signal null
[2026-02-17 16:14:18.925] [error] Unhandled exception during server start Error: Python process exited with code 3221225477 and signal null

3 Likes
4

Same..! I’m using RTX50 serie
I am unable to start ComfyUI Desktop v0.8.5.
When I open the logs, the window suddenly closes.

1 Like
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I started having this issue after updating Adrenaline drivers from 6.2.1 to 6.2.2

I haven’t tried downgrading the drivers because it broke my PC last time i did.

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I found the culprit, at least for me.

This error code 3221225477 happens when i have my second screen on and set up as extended desktop, when i use the main screen the issue is gone and the program runs without issues.

My main screen is connected to 7900xt and my second screen is connected to the iGPU, so i guess the issue is that ComfyUI is unable to recognize the primary GPU, i guess.

Hope this helps for people having this similar problem.

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Greetings. For me the issue was during the install windows defender blocked the app from installing correctly. To anyone who reads this make sure you have your antivirus turned off during install of the app if you use the installer version.

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Same issue here. Windows 11 Pro, ComfyUI v0.8.18 fails to start the server. Worked fine yesterday. Troubleshooting shows all checks green except for clearing the cache, but when I do that, and hit continue, it still fails to start. Need advice please.