[macOS app] Existing chats hang after Wi-Fi SSID switch until restart

What version of the Codex App are you using (From “About Codex” dialog)?

26.803.61601 (build 6396); bundled codex-cli 0.147.0-alpha.6.5

What subscription do you have?

ChatGPT Plus

What platform is your computer?

Darwin 25.5.0 arm64 arm; macOS 26.5.2 (25F84); MacBook Air (M1, 8 GB)

What issue are you seeing?

After macOS switches between two working Wi-Fi SSIDs, an existing Codex chat often stops processing new messages. The submitted turn remains “thinking” indefinitely, with no assistant output or status change.

Both Wi-Fi networks are stable and internet access continues to work normally in other apps. Codex sometimes recovers after about 2 minutes, but often takes 5+ minutes. Fully quitting and reopening the Codex app restores normal operation.

This happens on every observed SSID switch, whether macOS switches automatically or I switch manually. I have only observed it in existing chats.

What steps can reproduce the bug?

1. Open an existing Codex chat and confirm new turns work.
2. Switch from Wi-Fi SSID A to SSID B, manually or through macOS automatic switching. Both networks have working internet.
3. Submit a new message in the existing chat.
4. Observe that Codex remains “thinking” with no output or status change, sometimes for 2–5+ minutes.
5. Quit and reopen Codex; the chat accepts and processes input again.

What is the expected behavior?

Codex should detect the network-interface/SSID transition, reconnect its session transport, and process the new turn promptly without requiring an app restart.

Additional information

Reproduction rate: every observed Wi-Fi SSID switch.

The issue appears isolated to Codex session recovery: connectivity in browsers and other apps remains normal throughout. No error message is shown.

No VPN, custom DNS, DNS filtering, proxy, or other network-routing/changing mechanism is configured on this Mac.

Related: #30777 reports similar behavior with possible Tailscale/DNS involvement; this reproduction occurs without those mechanisms and is consistently observed in existing desktop chats.