## Problem Description
When programming with Codex, the `worker exited with code 0` error page consistently appears without any clear information, which is unusual.
Then, if you stop the service, you might even find that even though the service has been stopped, accessing `http://localhost:9191/` (service address) still displays the Nuxt error page!!!
## Cause of the Problem
This issue is quite complex, but to put it simply, it's caused by the combined effect of two factors:
1. Codex's sandbox environment might automatically start services, and surprisingly, the port it occupies might be the same as the one used by your locally started service! Even if you stop your own locally started service, there might still be residual processes caused by Codex!
2. Codex's most recent code modification has introduced an issue, such as parameters not being found, invalid references, etc.
When these two situations occur simultaneously, the problem can be reproduced almost 100%!
## Solution
Taking `Windows` as an example, the simplest method is:
1. Open the Windows Task Manager.
2. Find all `node.exe` or `Node.js` processes.
3. Manually terminate these Node.js processes.
4. Confirm that `http://localhost:9191/` can no longer be accessed.
5. Restart your project service.
If you want to use commands to confirm whether the port is still occupied, you can execute:
```powershell
netstat -ano | findstr :9191
```
If you still see content similar to this:
```text
TCP 127.0.0.1:9191 LISTENING 8928
```
It indicates that `9191` is still occupied by a process, and the number in the last column is the PID.
You can also terminate the process by PID, for example:
```powershell
Stop-Process -Id 8928
```
## Subsequent Notes
Based on my usage habits, I do not want AI to start any services for my applications, as this makes it unclear whether they have been started and what their status is. In short, I expect my Codex not to proactively start, restart, or keep my project services running in the background.
If you encounter a situation again where "the service is stopped but localhost is still accessible," first check if there are any `node.exe` processes occupying the port, and then determine if it's a code-related issue.
