Vaadin-XS addon and session managment


Are there some issues with vaadin-xs addon and session managment? I’m using Vaadin 6.8.8 with vaadin-xs (to embedded my app with a div in a cross-site) and very often I’m facing with “Communication problem” and/or “Session expired” messages.

I have my web.xml with a 30 minutes session:


But sometimes when I start my application it shows the communication problem.

I do a search in this forum and in google but I didn’t find anything related to vaadin-xs and sessions, well, I’m not sure if this problem is related to vaadin-xs.

What should I be aware about vaadin.-xs and session managment?