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codex - 💡(How to fix) Fix Codex app in-app browser automation fails with "failed to start codex app-server: The system cannot find the path specified. (os error 3)" on Windows [2 comments, 2 participants]

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openai/codex#20496•Fetched 2026-05-01 05:42:31
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Error Message

failed to start codex app-server: The system cannot find the path specified. (os error 3)

  • Codex throws the app-server path error and cannot automate the page failed to start codex app-server: The system cannot find the path specified. (os error 3)
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I’m using Codex Desktop on Windows and browser automation is failing in the in-app browser.

What works:

What fails:

  • As soon as Codex tries to inspect or control the live in-app browser tab, it errors with:

failed to start codex app-server: The system cannot find the path specified. (os error 3)

<img width="1898" height="1234" alt="Image" src="https://github.com/user-attachments/assets/ccada8be-5b8c-4451-8e13-c70f4862339b" />

Important details:

  • This is happening inside the Codex in-app browser, not Firefox or another external browser
  • The page is already open and visible in the Codex browser pane
  • The failure happens when automation attempts to attach to or control the tab

Expected behavior:

  • Codex should be able to inspect and control an already open in-app browser tab

Actual behavior:

  • Codex throws the app-server path error and cannot automate the page

Steps to reproduce:

  1. Open Codex Desktop on Windows
  2. Open the in-app browser
  3. Navigate to a live page, for example: https://casinobonusstreak.com/wp-admin/admin.php?page=fluentcrm-admin#/
  4. Ask Codex to inspect or control the current in-app browser tab
  5. Codex fails with: failed to start codex app-server: The system cannot find the path specified. (os error 3)

Environment:

  • Windows
  • Codex Desktop
  • In-app browser open on a logged-in WordPress / FluentCRM page

extent analysis

TL;DR

The issue is likely due to a path configuration problem with the Codex app-server, and verifying the app-server path and ensuring it is correctly set may resolve the issue.

Guidance

  • Check the Codex configuration files or settings to ensure the app-server path is correctly specified and the system can find the path.
  • Verify that the app-server executable or script is present in the specified path and has the correct permissions.
  • Try to manually start the app-server from the command line or terminal to see if it throws any errors, which could help identify the issue.
  • Review the Codex documentation or support resources to see if there are any known issues or workarounds related to the app-server path configuration on Windows.

Notes

The issue seems to be specific to the Windows environment and the Codex Desktop application, so any solution may need to take into account the specifics of this setup.

Recommendation

Apply workaround: Try to manually configure the app-server path or check for any known issues or workarounds in the Codex documentation, as this may help resolve the issue without requiring an upgrade or significant changes.

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