Are you referring to an application connection or a LAN connection? If the LAN connection times out or loses connectivity, it could be a DHCP issue or an issue with either the client NIC or the LAN switch port. If this is an application disconnect problem, you need to provide more information about the specific application and client/server OS version(s). Some applications simply have timeout settings for inactive sessions. This is not a function of the client but is a feature of the application and its configuration.