codex - 💡(How to fix) Fix New CLI bwrap sandbox fails before shell: RTM_NEWADDR loopback Operation not permitted [2 comments, 3 participants]

TL;DR

Reverting to Codex CLI version 0.123 may resolve the issue, but it comes with the limitation of not being able to use GPT 5.5.

Guidance

• The error message bwrap: loopback: Failed RTM_NEWADDR: Operation not permitted suggests a permissions issue, potentially related to the sandboxing feature in Codex CLI.
• The fact that reverting to version 0.123 fixes the issue implies that the problem might be specific to version 0.124.
• To mitigate the issue, you could try running the Codex CLI with full permissions or disabling the sandbox feature if possible.
• Consider weighing the trade-offs between using the latest features (like GPT 5.5) and the stability of an older version (0.123).

Notes

The issue seems to be version-specific, and there might be a conflict between the new features introduced in version 0.124 and the existing permissions or sandboxing setup.

Recommendation

Apply workaround: Revert to Codex CLI version 0.123 if accessing internal computer files is a priority, and the limitations of not using GPT 5.5 are acceptable.