codex - 💡(How to fix) Fix Codex App Remote SSH times out on codex --version probe after successful SSH path probe

What happened

Codex App Remote SSH connects to a Linux host far enough to complete the SSH/path probe, but then fails during the installed Codex version probe. The app reports:

SSH: codex --version check timed out after 30000ms

Manual SSH from the same Windows client to the same SSH config alias returns immediately for the same checks.

Environment

• Client: Codex App on Windows using Windows OpenSSH
• Remote: Linux host
• Remote Codex CLI: codex-cli 0.130.0
• SSH config entry: concrete alias, public-key auth, no ProxyCommand/ProxyJump

Manual SSH checks that work

From the client shell:

ssh <ssh-alias> "command -v codex; codex --version; codex -V"

Output:

/usr/local/bin/codex
codex-cli 0.130.0
codex-cli 0.130.0

The remote app-server help path also exits successfully through SSH:

ssh <ssh-alias> "codex app-server --help"

The remote login-shell startup path was checked separately, and command -v codex resolves to /usr/local/bin/codex.

Codex App log pattern

The Codex App selects the intended SSH host and the SSH path probe succeeds:

selected app-server transport hostId=<redacted>
sshHost=<redacted> sshPhase=connect sshPort=22
codex_path_probe code=0

Then the version probe times out:

app_server_connection.installed_codex_version_probe_failed errorMessage="SSH: codex --version check timed out after 30000ms" hostId=<redacted>
app_server_connection.transport_connect_failed errorMessage="SSH: codex --version check timed out after 30000ms" hostId=<redacted>
connection_state_changed error={"code":"connection-failed","message":"SSH: codex --version check timed out after 30000ms"}

Expected behavior

If the app can complete the SSH path probe and manual ssh <alias> "codex --version" returns immediately, the Codex App version probe should also complete and proceed to app-server startup.

Actual behavior

Codex App Remote SSH fails the connection after 30 seconds at the installed Codex version probe, even though manual SSH version checks and codex app-server --help work.

Notes

This looks distinct from public-key/PAM authentication failures because manual public-key SSH succeeds, the app reaches the path probe, and codex_path_probe exits with code 0 before the timeout.

Related but not exact matches I found while searching: #20128, #23037.