[BUILD] Does reflex use port 29648 internally?

[sandyowlet]

Describe the issue

I encountered an error when trying to self-host a project and use 29648 as the backend port. WebSocket connections could be established successfully, but the frontend's sent events were not receiving a response.

I spent an afternoon looking for the problem until I found that when I changed the port to some other value.

I would like to know if the reflex use the 29648 internally, or maybe I'm just encountering other connection issues?

Confirmed via devtools that the websocket connection is correctly created and the front end can send events
...

Environment

• Reflex Version: 0.8.25
• Python Version: 3.13
• OS: windows
• Browser: chrome