bi dashboard errors

HI 

when i browse bi dashboards in our internet site portal 

we receive following errors in our reporting server in which 

analysis server,reporting servers are running

The Unattended Service Account "XYZPORTAL\sppps" does not have access to the following data source server.  Data source location: http://www.xyz/ar-sa/Notary/Rspointer/Data Connections for PerformancePoint/7_.000 Data source name: XYZBI_NOTARY_02_AS_RealestateSaleCube Server name: 10.xxx.5.64  Exception details: Microsoft.AnalysisServices.AdomdClient.AdomdConnectionException: A connection cannot be made. Ensure that the server is running. ---> System.IO.IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond   

 at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)     -

 --End of inner exception stack trace ---   

 at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)   

 at System.IO.BufferedStream.Read(Byte[] array, Int32 offset, Int32 count)   

 at Microsoft.AnalysisServices.AdomdClient.DimeRecord.ForceRead(Stream stream, Byte[] buffer, Int32 length)   

 at Microsoft.AnalysisServices.AdomdClient.DimeRecord.ReadHeader()   

 at Microsoft.AnalysisServices.AdomdClient.DimeReader.ReadRecord()   

 at Microsoft.AnalysisServices.AdomdClient.TcpStream.GetResponseDataType()     -

 --End of inner exception stack trace ---   

 at Microsoft.AnalysisServices.AdomdClient.XmlaClient.Connect(ConnectionInfo connectionInfo, Boolean beginSession)   

 at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.XmlaClientProvider.Connect(Boolean toIXMLA)   

 at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.ConnectToXMLA(Boolean createSession, Boolean isHTTP)   

 at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.Open()   

 at Microsoft.PerformancePoint.Scorecards.DataSourceProviders.AdomdConnectionPool`1.<>c__DisplayClass2.<GetConnection>b__0()   

 at Microsoft.SharePoint.SPSecurity.<>c__DisplayClass4.<RunWithElevatedPrivileges>b__2()   

 at Microsoft.SharePoint.Utilities.SecurityContext.RunAsProcess(CodeToRunElevated secureCode)   

 at Microsoft.SharePoint.SPSecurity.RunWithElevatedPrivileges(WaitCallback secureCode, Object param)   

 at Microsoft.SharePoint.SPSecurity.RunWithElevatedPrivileges(CodeToRunElevated secureCode)   

 at Microsoft.PerformancePoint.Scorecards.DataSourceProviders.AdomdConnectionPool`1.GetConnection(String connectionString, ConnectionContext connectionCtx, String effectiveUserName, CultureInfo culture, NewConnectionHandler newConnectionHandler, TestConnectionHandler testConnectionHandler)

and also i am receiving following errors

XML for Analysis parser: The XML for Analysis request timed out before it was completed.  Microsoft.AnalysisServices.AdomdClient.AdomdErrorResponseException: XML for Analysis parser: The XML for Analysis request timed out before it was completed.   
 at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.XmlaClientProvider.Microsoft.AnalysisServices.AdomdClient.IExecuteProvider.ExecuteMultidimensional(ICommandContentProvider contentProvider, AdomdPropertyCollection commandProperties, IDataParameterCollection parameters)    
 at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.ExecuteCellSet()    
 at Microsoft.PerformancePoint.Scorecards.DataSourceProviders.AdomdDataSourceProvider.RunQueryInternal(String query, Boolean isCellSet, Int32 sessionTimeout)  ‏‏رمز خطأ "خدمات PerformancePoint" هو 10116.

---

adil