Issue With Vaadin on Tomcat. Push related?

I’m having issues getting Vaadin to work with any setup on a Tomcat server. Tomcat serves the site correctly but the Vaadin session imediatly times out. The only error I can find is in the debug console of the site:

“Response didn’t contain a server id. Please verify that the server is up-to-date and that the response data has not been modified in transmission.”

Using Jetty servers seems to fix the issue so I think it is tomcat related.

I can’t seem to find any 8.1 projects the run off of servlets and tomcat to use for reference.

Thanks in advance for any help.

Here’s an older thread about the same issue - check that if it helps: https://vaadin.com/forum#!/thread/13302249

Regards,

Olli