Hi guys,

I recently deployed crystal reports for VS2010 to my production server. I worked fine for a while and suddenly it started to fail with the exception details: "System.Runtime.InteropServices.COMException: Access is denied." and the following stack trace.
Code:
[COMException (0x80004005): Access is denied.]
   CrystalDecisions.ReportAppServer.ClientDoc.ReportClientDocumentClass.Open(Object& DocumentPath, Int32 Options) +0
   CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.Open(Object& DocumentPath, Int32 Options) +94
   CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.EnsureDocumentIsOpened() +374

[CrystalReportsException: Load report failed.]
   CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.EnsureDocumentIsOpened() +436
   CrystalDecisions.CrystalReports.Engine.ReportDocument.Load(String filename, OpenReportMethod openMethod, Int16 parentJob) +877
   CrystalDecisions.CrystalReports.Engine.ReportClass.Load(String reportName, OpenReportMethod openMethod, Int16 parentJob) +1185
   CrystalDecisions.CrystalReports.Engine.ReportDocument.EnsureLoadReport() +108
   CrystalDecisions.CrystalReports.Engine.ReportDocument.SetDataSourceInternal(Object val, Type type) +53
   CrystalDecisions.CrystalReports.Engine.ReportDocument.SetDataSource(DataSet dataSet) +66
   AdNexus.RG_Cockpit.Website.earnings.cr_report.Report.GetReport(Int32 rn_number, Boolean lifetime, Int32 weekNumber) in D:\projects\adnexus\AdNexus\AdNexus.RG_Cockpit.Website\earnings\cr_report\Report.cs:123
   AdNexus.RG_Cockpit.Website.earnings.cr_report.report.Page_Load(Object sender, EventArgs e) in D:\projects\adnexus\AdNexus\AdNexus.RG_Cockpit.Website\earnings\cr_report\report.aspx.cs:39
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207
After doing some research, I found out that there were temp files created in C:/windows/temp. I changed this directory to a directory in the website itself. I also made sure that all reports where disposed correctly. I watched the temp folder, and all temp files were deleted correctly.

Now, after a few days, the same error starts happening again. Taking a look in the temp folder, a lot of temp files where not deleted. I deleted all files in the temp folder, run a report in the browser while watching the temp folder. The exception happens again, and I can see that a temp file is generated but not deleted.

What is causing the access denied then? It seems that it creates the temp file, cannot open it, the exception is thrown and finally the temp files are not deleted. But why are the files deleted in the beginning, and after a while not?

Any one any ideas how to solve this?