Codex app SSH connection to native Windows host fails: app-server unix:// creates regular file and websocket closes code=1006

Summary

Codex app SSH connection to a native Windows OpenSSH host authenticates and reaches the remote shell, but the remote app-server path fails. The UI reports:

Codex app-server websocket closed (code=1006)

Environment

Client:

• Codex desktop app on Windows
• Local bundled codex: codex-cli 0.131.0-alpha.9
• OpenSSH_for_Windows_9.5p2, LibreSSL 3.8.2

Remote host:

• Windows host at 10.82.0.168
• OpenSSH server
• User: Lab
• Git Bash configured as OpenSSH DefaultShell
• uname -a: MINGW64_NT-10.0-26100 bf3-qm-desktop 3.5.7-463ebcdc.x86_64 2025-03-03 17:26 UTC x86_64 Msys
• ssh -V: OpenSSH_9.9p2, OpenSSL 3.2.4 11 Feb 2025
• Remote PATH codex: codex-cli 0.131.0
• Bundled remote Codex binary also tested: codex-cli 0.131.0-alpha.9

What works

SSH auth and shell setup work.

What fails

Codex launches codex app-server --listen unix://. On native Windows/Git Bash, ~/.codex/app-server-control/app-server-control.sock is created as a regular zero-byte file, not a socket. Then codex app-server proxy hangs and the Codex desktop UI reports websocket closed code=1006.

Expected

Either native Windows SSH hosts should work, or Codex should detect unsupported unix:// socket behavior and show a clear message recommending WSL/Linux.