You receive an error message when you try to open a Web page in an ASP.NET application

When you try to open a Web page in your Microsoft ASP.NET application, you receive the following error:

This problem may occur when you enable cross-site scripting detection on Check Point Firewall on your private network. The cross-site scripting check may corrupt the view state of the ASP.NET application page.

To work around this problem, you can disable the cross-site scripting detection or you can store the view state on the server. To disable cross-site scripting detection on your Check Point Firewall-1, see your Check Point Firewall-1 documentation. For more information, visit the following Check Point Web site: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

To store the view state on the server, use the following code sample:

C#:

protected override object LoadPageStateFromPersistenceMedium() { 
   return Session["_ViewState"]; 
}

protected override void SavePageStateToPersistenceMedium(object viewState)
{ 
       Session["_ViewState"] = viewState; 
}


VB.NET

Protected Overrides Function LoadPageStateFromPersistenceMedium() As Object
        Return Session("_ViewState")
End Function

Protected Overrides Sub SavePageStateToPersistenceMedium(ByVal viewState As Object)
        Session("_ViewState") = viewState
End Sub

For additional information, click the following article number to view the article in the Microsoft Knowledge Base: