Report Export Logon Failed

In case of Visual Studio.net 2003

"CrystalReportWebFormViewer2"
What are default files in this virual directory.

I have 2 environments :

1. Test Environment has following things
[images] folder
crystalimagehandler.aspx

2. Production Environment
[images] folder
crystalimagehandler.aspx
EnterpriseReportManager.asmx
EnterpriseReportService.asmx
ServerFileReportManager.asmx
ServerFileReportService.asmx
web.config

In test environment,
I am trying to export one crystal report in PDF format.
but getting error "Logon failed" at the time of "report.export()"

I already tried report.SetDatabaseLogon("User", "Pwd") but no change.
And Local Path of virtual directory is correct.

Is it because "CrystalReportWebFormViewer2" virtual direcotry is having less files ?

If that is the case then, do I need to reinstall VS 2003 in Test Environ ?
Or copying files from "PROD" to "TEST" will work ?

Thanks
Mahesh