Dynamics CRM 2011 SSRS Reporting Error (rsProcessingAborted) 0x8004832C

I have Microsoft Dynamics 2011 with a distributed installation. 
**One server for SQL server and Reporting
**Another one for CRM Server 

I have installed SSRS Reporting extensions, and Standard reports work fine.

But, When I run a created report wich was created from report's wizard, CRM throws an error.
ReportServerException: Error to process the report. (rsProcessingAborted)

I got trace data from CrmDiagTool, I paste this data:

MSCRM Error Report:
--------------------------------------------------------------------------------------------------------
Error: Exception of type 'System.Web.HttpUnhandledException' was thrown.

Error Number: 0x8004832C
Error Message: An error occurred during report rendering.
Error Details: An error occurred during report rendering
Source File: Not available
Line Number: Not available
Request URL: https://vass.crm5.vass.es:444/CRMReports/rsviewer/reportviewer.aspx
Stack Trace Info: [ReportServerException: The target principal name is incorrect]
[ReportServerException: A call to SSPI failed, see inner exception.]
[ReportServerException: A call to SSPI failed, see inner exception.]
[ReportServerException: An unexpected error occurred.]

[ReportServerException: 
Microsoft.Crm.CrmException: An unexpected error occurred.
System.ServiceModel.Security.SecurityNegotiationException: A call to SSPI failed, see inner exception.
System.Security.Authentication.AuthenticationException: A call to SSPI failed, see inner exception.
System.ComponentModel.Win32Exception: The target principal name is incorrect]

[ReportServerException: Error de ejecución de consulta para el conjunto de datos 'DSMain'. (rsErrorExecutingCommand)]

[ReportServerException: Error al procesar el informe. (rsProcessingAborted)]
   at Microsoft.Reporting.WebForms.ServerReport.ServerUrlRequest(Boolean isAbortable, String url, Stream outputStream, String& mimeType, String& fileNameExtension)

Thank you in advance for your help.