Problems with Web Sockets in IE 10

Hello,

I have a problem to use Web Sockets from IE 10, sample applications (e.g. http://www.websocket.org/echo.html) fails.

Developer console shows  "SCRIPT12008: WebSocket Error: Incorrect HTTP response. Status code 403, Forbidden" error to me and captured network traffic shows that IE even didn't try to connect.

It seems to be a particular box issue since it works ok on others but is there any setting that should be enabled to make it work?

Thanks,

Taras