Report session timeout and other errors suddenly happening after over a year of no problems...

Hello,

Reports have been running perfectly for a long time. All of a sudden, today they are not the same. Now getting session timeout errors and the stuff below. Also the toggle image intermittently disappears.

I have placed this in the config file:

<system.web>
        <sessionState mode="InProc" timeout="1440" />
        <httpRuntime maxRequestLength="20000" executionTimeout="1440"/>

and

<httpHandlers>
            <add path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
                validate="false" />

 

But still errors keep happening. Any ideas would be helpful. Here is the EventViewer error:

Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 6/23/2008 2:07:25 PM
Event time (UTC): 6/23/2008 6:07:25 PM
Event ID: a4afc02fdaf247d783ac5620fe75b2ee
Event sequence: 4
Event occurrence: 1
Event detail code: 0
 
Application information:
    Application domain: /LM/W3SVC/1/Root/reports-1-128587180452129940
    Trust level: Full
    Application Virtual Path: /qareports
    Application Path: C:\Program Files\Reports\
    Machine name: HOST
 
Process information:
    Process ID: 5276
    Process name: w3wp.exe
    Account name: HOST\Administrator
 
Exception information:
    Exception type: AspNetSessionExpiredException
    Exception message: ASP.NET session has expired
 
Request information:
    Request URL: http://host/path/Reserved.ReportViewerWebControl.axd?Mode=true&ReportID=4bcdefaad29748c0b606046b673f2426&ControlID=87790dc8be5d490b8509067dcb2e209c&Culture=1033&UICulture=1033&ReportStack=1&OpType=ReportImage&ResourceStreamID=8.0.50727.762ToggleMinus.gif
    Request path: /path/Reserved.ReportViewerWebControl.axd
    User host address: 10.68.234.42
    User: 
    Is authenticated: False
    Authentication Type: 
    Thread account name: HOST\Administrator
 
Thread information:
    Thread ID: 1
    Thread account name: HOST\Administrator
    Is impersonating: False
    Stack trace:    at Microsoft.Reporting.WebForms.ReportDataOperation..ctor()
   at Microsoft.Reporting.WebForms.HttpHandler.GetHandler()
   at Microsoft.Reporting.WebForms.HttpHandler.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
 

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--PhB