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codex - 💡(How to fix) Fix Codex Windows desktop app crashes on startup: app-server websocket closed code=3221225781

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Error Message

Error shown: Most recent error: Codex app-server websocket closed (code=3221225781)

  • Immediately after that, this error screen appears.
  • I tried creating config.toml with Windows sandbox settings, but the same error happened.
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Codex Windows desktop app crashes immediately after opening.

Error shown: (code=3221225781, signal=null) Most recent error: Codex app-server websocket closed (code=3221225781)

What happens:

  • I install/open Codex on Windows.
  • The app checks for updates and says the latest version is installed.
  • Immediately after that, this error screen appears.
  • Reload does not fix it.
  • Check for updates does not fix it.
  • Open Config.toml does nothing.
  • I manually checked C:\Users\DeAnno.codex.
  • There was no config.toml originally.
  • I tried creating config.toml with Windows sandbox settings, but the same error happened.
  • I also tried Repair/Reset from Installed Apps, but the crash still happens.
  • There is no sandbox.log file, so it may be crashing before sandbox startup.

Environment:

  • Windows 11 Pro
  • Codex installed from Microsoft Store
  • Using Codex desktop app, not VS Code
<img width="1202" height="747" alt="Image" src="https://github.com/user-attachments/assets/cc1a7a99-4725-4692-a8e1-02d8dc1627a8" />

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codex - 💡(How to fix) Fix Codex Windows desktop app crashes on startup: app-server websocket closed code=3221225781