codex - 💡(How to fix) Fix Reopen #3927: codex auth login fails with "Port 127.0.0.1:1455 is already in use" on WSL [1 participants]

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openai/codex#17227Fetched 2026-04-10 03:43:43
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What version of the Codex App are you using (From “About Codex” dialog)?

latest

What subscription do you have?

pro

What platform is your computer?

No response

What issue are you seeing?

The issue is still present for people using wsl2 not in NAT mode. Port 1455.

What steps can reproduce the bug?

using the app

What is the expected behavior?

No response

Additional information

Please provide options to use other ports rather than forcing users to use nat networking mode for wsl2. That can't be a meaningful solution, as there are legitimate reasons to have networking mode not in NAT.

extent analysis

TL;DR

Consider using a different port or configuring the network settings to resolve the issue with the Codex App on WSL2.

Guidance

  • The issue seems to be related to the port 1455 being used by the Codex App, which is causing problems for users with WSL2 not in NAT mode.
  • To mitigate this, the app could be configured to use a different port, or the user could change their network settings to allow the app to function correctly.
  • Providing options for users to choose alternative ports could be a viable solution, as suggested in the additional information.
  • Investigate the network configuration of WSL2 to understand how it interacts with the Codex App and port 1455.

Notes

The issue lacks information about the user's computer platform and expected behavior, which could be helpful in providing a more specific solution.

Recommendation

Apply workaround: Provide options for users to choose alternative ports, as this would allow users to continue using the app without having to switch to NAT mode, which may not be desirable for legitimate reasons.

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