I have a Production Web Server 2008 R2 with SQL Server 2008 R2 and we have been seeing the following appearing regularly in the event viewer. Our web application utilises ASP.NET v2.0.50727 and when this error occurs it causes crashes on the application. The only way to fix this when it occurs is to recycle the application pool of the offending application. It has been affection reporting services on the same server also and when multiple sites are on the server each can be affected at different times. I would also like to note that we have the exact same setup replicated on approx 15 different 2008 R2 servers where we dont experience the same issues. What steps can I take to trouble shoot this issue and what could I do to repair the problem. Here are some of the event logs: ##--------------------------------## Event code: 3005 Event message: An unhandled exception has occurred. Event time: 17/01/2012 12:53:12 Event time (UTC): 17/01/2012 12:53:12 Event ID: b05090bdf5ae45bbb3f0aeaaa5f91d7c Event sequence: 4 Event occurrence: 1 Event detail code: 0 Application information: Application domain: ReportServer_MSSQLSERVER_0-1-129712783751083984 Trust level: RosettaSrv Application Virtual Path: /ReportServer Application Path: D:\Program Files\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services\ReportServer\ Machine name: SERVERNAME Process information: Process ID: 2780 Process name: ReportingServicesService.exe Account name: SERVERNAME\username Exception information: Exception type: ReportServerException Exception message: The report execution uglxey55hhrd1tjtmg1ulp55 has expired or cannot be found. (rsExecutionNotFound) Request information: Request URL: https://SERVERURL:443/ReportServer/Reserved.ReportViewerWebControl.axd?ExecutionID=uglxey55hhrd1tjtmg1ulp55&Culture=2057&CultureOverrides=False&UICulture=9&UICultureOverrides=False&ReportStack=1&ControlID=1583249a9eff41caa7cc20ece4cb8957&OpType=Export&FileName=ReportName&ContentDisposition=OnlyHtmlInline&Format=XML Request path: /ReportServer/Reserved.ReportViewerWebControl.axd User host address: xxx.xxx.xxx.xxx User: Is authenticated: False Authentication Type: Thread account name: SERVERNAME\username Thread information: Thread ID: 14 Thread account name: SERVERNAME\username Is impersonating: False Stack trace: at Microsoft.Reporting.WebForms.ServerReport.EnsureExecutionSession() at Microsoft.Reporting.WebForms.ServerReport.SetExecutionId(String executionId, Boolean fullReportLoad) at Microsoft.Reporting.WebForms.ReportDataOperation..ctor(Boolean requiresFullReportLoad) at Microsoft.Reporting.WebForms.ExportOperation..ctor() at Microsoft.Reporting.WebForms.HttpHandler.GetHandler(String operationType) 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) Custom event details: ##--------------------------------## Event code: 3005 Event message: An unhandled exception has occurred. Event time: 16/01/2012 15:50:35 Event time (UTC): 16/01/2012 15:50:35 Event ID: 40479ed26a1040b7bf45a4c548305d71 Event sequence: 11 Event occurrence: 1 Event detail code: 0 Application information: Application domain: /LM/W3SVC/1/ROOT/SITE-44-129712026316621093 Trust level: Full Application Virtual Path: /SITE Application Path: D:\APPS\SITE\web\ Machine name: SERVERNAME Process information: Process ID: 4576 Process name: w3wp.exe Account name: SERVERNAME\username Exception information: Exception type: AccessViolationException Exception message: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. Request information: Request URL: https://SITEURL:443/SITE/site/tier/view.aspx?Tier_ID=5&NextURL=&Status_ID=1&Keepcrumb= Request path: /SITE/site/tier/view.aspx User host address: xxx.xxx.xxx.xxx User: To be implemented Is authenticated: True Authentication Type: Thread account name: SERVERNAME\username Thread information: Thread ID: 10 Thread account name: SERVERNAME\username Is impersonating: False Stack trace: at System.Web.Hosting.UnsafeIISMethods.MgdGetCurrentNotification(IntPtr pRequestContext) at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) Custom event details: ##--------------------------------##

Check this similar thread on Asp.Net forum. For ASP.net queries, post here. http://forums.asp.net/ Thanks

Server 2008 R2 service pack one seems to have fixed the issue for now.

We have sp 1 and we still have this issue.