Codex macOS sandbox prevents Playwright browser tests from starting (bootstrap_check_in Permission denied (1100), listen EPERM 127.0.0.1) #14368
Description
Summary
In Codex on macOS with sandboxing enabled, Playwright browser tests fail due to environment restrictions before app logic runs.
I see two failures:
- Chromium startup crash:
FATAL:base/apple/mach_port_rendezvous_mac.cc:155
Check failed: kr == KERN_SUCCESS.
bootstrap_check_in org.chromium.Chromium.MachPortRendezvousServer.<pid>: Permission denied (1100)
- Local server bind failure:
Error: listen EPERM: operation not permitted 127.0.0.1
The same tests pass on the same machine outside the Codex sandbox.
Repro
This kind of command fails in sandbox:
npx playwright testExpected
Either:
- browser-backed tests can run, or
- Codex clearly reports that sandbox policy blocks Chromium startup / localhost binding
Actual
The failure looks like a repo/test regression even though it is a sandbox restriction.
Why this matters
This can cause agents to:
- misdiagnose healthy repos as broken
- modify working code to work around sandbox-only failures
- waste time debugging Playwright/app logic unnecessarily
Request
Please document or surface these sandbox limitations more explicitly on macOS:
- Chromium startup restrictions
- loopback bind restrictions (
127.0.0.1)
Additional context
I have a local repro and internal notes with the exact failure signatures if that would help.