Article ID: 310619 - View products that this article applies to.
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When you browse to mobile Web Forms, you may receive the following error message if view state or session state is lost or has expired:
System.Exception: The page requires session state that is no longer available. Either the session has expired, the client did not send a valid session cookie, or the session state history size is too small. Try increasing the history size or session expiry limit.
This problem occurs because virus scanning software performs real-time scanning while you build an application.
To resolve this problem, disable real-time scanning when you build the application. You can also disable real-time scanning for the application directory.
Mobile Web Forms applications store view state information in a session variable on the server. Because the view state is saved in the session, view state may expire when the server application restarts, which also restarts the session.
An application may restart for many reasons. One reason is because the virus software scans incoming and outgoing files in real time. This can disrupt the session state of your mobile Web application immediately after you build your application in Microsoft Visual Studio .NET.
(http://support.microsoft.com/kb/309337/EN-US/ )PRB: Exceptions Occur When You Run ASP.NET Applications and Inoculan Antivirus Software