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We have several clients who connect to our AS400 via client access for windows. &nbsp;They vpn through our ISA 2004 (all updates) and connect to our AS400 via it local address 10.x.x.x. &nbsp;Some offices drop several connections. &nbsp;When I do it from my house I can stay on it all day without dropping. &nbsp;Any ideas on what could be causing this? 
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We have several clients who connect to our AS400 via client access for windows.  They vpn through our ISA 2004 (all updates) and connect to our AS400 via it local address 10.x.x.x.  Some offices drop several connections.  When I do it from my house I can stay on it all day without dropping.  Any ideas on what could be causing this? 

Dropped AS400 connections

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

IBM i, formerly known as AS/400, is a proprietary, midrange, object-based operating and application system. It includes a relational database, a menu-driven interface, support for multiple users, block-oriented terminal support and printers, and supports security, communications, and web-based application servers including Websphere, Apache and Tomcat.