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Windows Smart App Control Is Blocking Your Python CLIs (os error 4551) — What To Do

This story is from 2026-08-26. It is preserved in the archive; the latest stories are on the live feed.

If you've seen this error on Windows 11, you probably assumed your install was broken. Easy to think that. The tool dies at spawn. No Python traceback, no error inside the app. Nothing. The actual problem isn't your tool at all. What's actually happening Smart App Control (SAC) is Microsoft's consu…

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  1. 2026-08-26 17:12 · DEV Community — AI
    Windows Smart App Control Is Blocking Your Python CLIs (os error 4551) — What To Do

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