Hey.

On Odoo Online I can use the new collaboration feature on the knowledge app, that you see where somebody else is typing, was other persons are marking and that you can simultaneous type in a document. (Like Google Docs)

This feature does not work in an OnPremise installation.
Im sure this feature is using some kind of web socket. 
Websocket is generally working on the OnPremise Instance

My debugging...

Chat is working.

I also double checked nginx, Odoo.conf etc. web socket is open.

Logs also show that handover to long polling seems to work.
2024-03-14 23:54:51,993 27 INFO xxx longpolling: xxx - - [2024-03-14 23:54:51] "GET /websocket HTTP/1.1" 101 450 128.613869 

2024-03-14 23:54:51,993 27 INFO x longpolling: xx - - [2024-03-14 23:54:51] "GET /websocket HTTP/1.1" 101 450 128.613869 

I can use this feature with the same PCs on Odoo Online. So im sure this has nothing to do with my local setup.

Any ideas?