I see the message repeated quite often in the log file, is this the same you see on console ?
10 Oct 2016 18:19:13,824 ERROR [DataFactoryException:102] getAttribute: Session already invalidated
10 Oct 2016 18:19:16,524 ERROR [DataFactoryException:104] java.lang.IllegalStateException: getAttribute: Session already invalidated
If yes, read though this article and you might find some clues
Knowledge Base Articles
This may be caused by things like:
- excessive load on the UMP causing it to fail to respond to browser requests in time
- network issues causing a drop in the established connection between UMP and the browser
- a proxy server in between UMP and the browser which is not properly set for "sticky sessions"
- antivirus or network security interfering with the connection between UMP and browser
- users sharing usernames/passwords, where multiple users are viewing the same page from the same location using the same username -- one user logging out may cause this error to appear for the other users who are using the same username