Any idea what is going on here (see screen shot)? Vaadin 23 on Tomcat 9.0.62
I can’t yet reproduce the root cause that triggers this, but once it starts happening the user’s session is pretty well hosed.

Note: you missed a URL in the first line to obfuscate :sunglasses:

Not 100% sure but looks like a hard to debug issue related to the usage of long-polling as push connection type. I would suggest to use the default and more reliable way with websocket over XHR

New fully obfuscated attachment

I’d prefer not to switch to Websocket as I’m not sure my load balancer and client platforms all support it.