If you use a computer with the Windows OS to browse into the Metasys system, be aware that the Site Management Portal UI session information is lost if you are logged in when the operating system goes to sleep. The session terminates at the time the operating system goes to sleep, regardless of the Inactive Session Property setting that applies to your Metasys user account; for example, if Never Terminate is set for your account, the Site Management Portal UI session still terminates. The Sleep option is enabled for 2 hours by default, so you may want to increase this setting or disable it.