Report in production prompts for database connection info

Question

Hi,
I'm using SAP Crystal Reports version for VS 2010 SP1. I'm trying to implement the most basic need--to create reports in a development environment and move them to production by just copying the .rpt files. I want to rely on the database connection string from web.config, but don't see how that is done. I've tried using ADO.NET DataSets from Project Data and can get the report to run while developing, but when I move to another server I'm always prompted with the "The report you requested requires further information" dialog.
I tried this solution, which keeps the db server name in a web.config variable:
           ReportDocument boReportDocument = new ReportDocument();
            boReportDocument.Load(Server.MapPath(rmCR.SelectedItem.Value.ToString()));
            ConnectionInfo boConnectionInfo = new ConnectionInfo();
            boConnectionInfo.ServerName = ConfigurationManager.AppSettings["dbServerName"];
            boConnectionInfo.DatabaseName = "dbCMRP_Employees";
            boConnectionInfo.IntegratedSecurity = true;
            ModifyConnectionInfo(boReportDocument.Database, boConnectionInfo);
            // Modify the ConnectionInfo for all tables in all subreports
            foreach (ReportDocument boSubreport in boReportDocument.Subreports)
                ModifyConnectionInfo(boSubreport.Database, boConnectionInfo);
            Session.Add("Report", boReportDocument);
            Response.Redirect("CrystalReportsViewer.aspx");
and this works fine in development, but when moved to a different server I get the "The report you requested requires further information" dialog. I've made sure that the db has the correct security settings, but can't find anything missing.
I'm sure I'm missing something basic, but can't seem to find any solution after searching for days. Any solution that allows me to create the report in VS 2010 and copy to a production server will be appreciated.
Thanks,
Dan

Answer 1

Thanks for your replies.
I think I've done what's outlined in the Troubleshooting Guide link that Ludek gave me.  I did install Process Monitor and found the "Access Denied" entry, but I'm not sure which folder needs permission given to IIS APPPOOL\ASP.NET v4.0.
Here's the entry from Process Monitor:
Description:        IIS Worker Process
Company:           Microsoft Corporation
Name:  w3wp.exe
Version:               7.5.7601.17514
Path:     C:\Windows\SysWOW64\inetsrv\w3wp.exe
Command Line:                C:\Windows\SysWOW64\inetsrv\w3wp.exe -ap "ASP.NET v4.0" -v "v4.0" -l "webengine4.dll" -a
.\pipe\iisipm461f344a-3d68-4e7c-b42e-ca18eac4553c -h "C:\inetpub\temp\apppools\ASP.NET v4.0\ASP.NET v4.0.config" -w "" -m 0 -t 20
PID:        7512
Parent PID:         3892
Session ID:          0
User:     IIS APPPOOL\ASP.NET v4.0
Auth ID:               00000000:00465886
Architecture:     32-bit
Virtualized:         False
Integrity:             High
Started:                8/29/2011 1:03:58 PM
Ended:  (Running)
Modules:
w3wp.exe           0x120000             0x8000  C:\Windows\SysWOW64\inetsrv\w3wp.exe      Microsoft Corporation                7.5.7601.17514
Microsoft.Web.Administration.dll            0x28ae0000        0x24000                C:\Windows\assembly\GAC_MSIL\Microsoft.Web.Administration\7.0.0.0__31bf3856ad364e35\Microsoft.Web.Administration.dll                Microsoft Corporation   6.1.7601.17514
App_Web_822ce1a1f503e532a2e860f7ce344f6d0d0f2eba.ascx.3417f053.eb4fk61t.dll     0x28b10000        0x8000                C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\intranet\58a686e6\86baa618\App_Web_822ce1a1f503e532a2e860f7ce344f6d0d0f2eba.ascx.3417f053.eb4fk61t.dll                n/a         0.0.0.0
App_Web_aed28e8a45aa161f6c9fc3f563283cb89b317bdc.ascx.3417f053.rodqolhn.dll     0x28c90000         0x8000                C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\intranet\58a686e6\86baa618\App_Web_aed28e8a45aa161f6c9fc3f563283cb89b317bdc.ascx.3417f053.rodqolhn.dll                n/a         0.0.0.0
pvlocale-1-0.dll 0x2fc80000          0x76000                C:\Program Files (x86)\SAP BusinessObjects\Crystal Reports for .NET Framework 4.0\Common\SAP BusinessObjects Enterprise XI 4.0\win32_x86\pvlocale-1-0.dll      SAP BusinessObjects                14.0.0.760
System.Data.Entity.ni.dll              0x2fd50000         0xcb8000                C:\Windows\assembly\NativeImages_v4.0.30319_32\System.Data.Entity\978e8514751373383f79c3fdd667aa2b\System.Data.Entity.ni.dll                Microsoft Corporation   4.0.30319.1