When you start the Microsoft Dynamics NAV Windows client or the Microsoft Dynamics NAV Web client, a connection is established with the Microsoft Dynamics NAV Server instance, and a corresponding session is added on Microsoft Dynamics NAV Server. Microsoft Dynamics NAV Server includes several timeout settings that determine when a session closes because of inactivity, a lost connection, or the client closes.
The Developer and IT Pro Help for Microsoft Dynamics NAV 2013 R2 includes a new topic that explains the session timeout behavior and configuration. For more information, see Understanding and Configuring Session Timeout in the MSDN Library.