RPC server is not listening

Hi there

when i tried to start Reporting Service i got that error "RPC server is not listening" 

the details message: 

ReportServicesConfigUI.WMIProvider.WMIProviderException: An error occurred when attempting to connect to the report server remote procedure call (RPC) end point. Verify that the Report Server Windows service is running, and then retry the operation.

 ---> System.Runtime.InteropServices.COMException (0x800706B3): The RPC server is not listening. (Exception from HRESULT: 0x800706B3)
   --- End of inner exception stack trace ---
   at ReportServicesConfigUI.WMIProvider.RSReportServerAdmin.ThrowOnError(ManagementBaseObject mo)
   at ReportServicesConfigUI.WMIProvider.RSReportServerAdmin.ListReportServersInDatabase(RSReportServerInfo[]& serverInfos)

so any idea??