windows sandbox failed: helper_unknown_error
Open 💬 1 comment Opened Jul 31, 2026 by askena-debug
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
What version of the Codex App are you using (From “About Codex” dialog)?
Version 26.721.81911
What subscription do you have?
Pro
What platform is your computer?
Windows 11
What issue are you seeing?
Codex fails before attaching to both the in-app browser and Chrome controller with windows sandbox failed: helper_unknown_error: setup refresh had errors. Full CDP access is enabled, Chrome is signed in, and the failure occurs before any page inspection.
What steps can reproduce the bug?
Feedback ID: 019fb450-7681-7433-8293-95346f16d2b6
What is the expected behavior?
Connect to Beehiiv and continue the production of newsletters
Additional information
I am really frustrated and plan to move to Claude Cowork/Code
1 Comment
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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