SAP Knowledge Base Article - Public

1766123 - Error: "Database logon failed."


  • A Crystal Reports .NET windows application to view a report fails with below error message on a client machine.

CrystalDecisions.CrystalReports.Engine.LogOnException: Database logon failed. ---> System.Runtime.InteropServices.COMException: Database logon failed.
at CrystalDecisions.ReportAppServer.Controllers.ReportSourceClass.Export (ExportOptions pExportOptions, RequestContext pRequestContext)
at CrystalDecisions.ReportSource.EromReportSourceBase.ExportToStream (ExportRequestContext reqContext)
--- End of inner exception stack trace ---
at CrystalDecisions.ReportAppServer.ConvertDotNetToErom.ThrowDotNetException (Exception e)
at CrystalDecisions.ReportSource.EromReportSourceBase.ExportToStream (ExportRequestContext reqContext)
at CrystalDecisions.CrystalReports.Engine.FormatEngine.ExportToStream(ExportRequestContext reqContext)
at CrystalDecisions.CrystalReports.Engine.FormatEngine.Export (ExportRequestContext eqContext)
at CrystalDecisions.CrystalReports.Engine.ReportDocument.ExportToDisk(ExportFormatType formatType, String fileName)

  •  Application works fine on development machine.


  • Visual Studio 2010
  • Crystal Reports for Visual Studio 2010
  • SQL Server 2008
  • Crystal report connects to database using OLEDB connection.


  • OLEDB drivers on the client machine are corrupted.
  • OLEDB drivers are not installed by Crystal Reports but the Operating System itself.


  • Repair the windows installation on the client machine to make sure the OLEDB drivers are functioning properly.
  • As a workaround, change the Crystal Reports connectivity from OLEDB to ODBC.


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SAP Crystal Reports, developer version for Microsoft Visual Studio