We have a web application (intranet) which we desire to keep the session open for as long as we can. In the web.config, I have the following line: <sessionState mode="InProc" timeout="480"></sessionState> but my session definately times out prior to 8 hours. Furthermore, on a Windows 2003 Standard 64 bit installation, the timeout seems to be about 5 minutes or so. On our development server, the timeout is greater than 5 minutes, but it is not the 8 hours I have it set to. We tried using sessionState mode=SQLServer and had issues with that, and I don't want to go that length just to get a property to behave as advertised.