vaadin push is not working in IE8 (Push connection using websocket failed!)

Please help, I get error Push connection using websocket failed! in IE8. Please have a look at screen shot attached. This works fine in firefox and chrome.

That is because IE8 doesn’t support websockets. See e.g.

However, Vaadin should gracefully fallback to HTTP streaming in case of IE8. Something is wrong; please give detailed information on what your server is, which Vaadin version you’re using, whether there are proxies or similar between the browser and the server, and, if possible, a short Vaadin program capable of reproducing the issue.