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.
http://jwebsocket.org/documentation/jwebsocket-supported-browsers
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.