Windows: responses_websocket connect to chatgpt.com/backend-api/codex/responses times out while responses_http succeeds

What version of Codex CLI is running?

0.117.0

What subscription do you have?

Enterprise

Which model were you using?

gpt-5.4

What platform is your computer?

Windows 11 x86_64

What terminal emulator and version are you using (if applicable)?

Windows Terminal

What issue are you seeing?

Codex intermittently selects responses_websocket, then stalls for ~15s per attempt and retries repeatedly before falling back to a working HTTP path.

From ~/.codex/log/codex-tui.log:

codex_api::endpoint::responses_websocket: connecting to websocket: wss://chatgpt.com/backend-api/codex/responses
event.name="codex.websocket_connect" duration_ms=15015 success="false" error.message="timeout"

Immediately after websocket failures, the same session can succeed with:

transport="responses_http"
POST https://chatgpt.com/backend-api/codex/responses

What steps can reproduce the bug?

1. Start a fresh Codex CLI session on Windows using ChatGPT auth.
2. Send a prompt.
3. On affected runs, Codex uses responses_websocket and retries after repeated ~15s connect timeouts. The UI will read "Retrying (N/5)..." until the 5 attempts are exhausted, then switches to HTTP, which works.

What is the expected behavior?

websocket requests don't so often timeout for no apparent reason.

Additional information

Relevant log (RUST_LOG=trace) fields on failing websocket attempts:

transport="responses_websocket"
websocket.warmup=false
endpoint="/responses"
auth_mode="Chatgpt"
auth.header_attached=true
auth.retry_after_unauthorized=false
auth_error=""
auth_error_code=""