When a user is not logged on (or had their session expired) and tries to reach a dashboard page, they get this error message:

The dashboard you requested either does not exist or you don't have access to it.
Perhaps you need to log in to see the page.

If the user is not logged in, the most graceful way to handle the use case would be to forward the user to the login page.

Workaround

If the default session timeout of 5 hours is too short, consider increasing it in all nodes.

Keep in mind that in DC deployments, session stickiness duration on the load balancer should be configured to a value that at least matches the session timeout parameter.