Login failed for user '(null)'

I'm getting the following error:
An error has occurred during report processing.
Cannot create a connection to data source 'MyReports-ReportServer-PHX'.
Login failed for user '(null)'. Reason: Not associated with a trusted SQL
Server connection.
This is only for data sources that use integrated authenticaiton. This is
on a fresh install of SQL Server 2005 and Reporting Services 2005 using
Visual Studio 2005. Per several articles/disuccsions, I've configured IIS
directory secruity to NOT allow anonymous access and to allow the Integrated
Windows Authentication exactly as I have on my other database server. This
is Windows Server 2003 IIS 6.0 and my other server is Windows 2000, IIS 5.0.
Any help would be GREATLY appreciated. Does this have something to do with
the IIS_WPG group not having correct permissions? The users do have the
correct permissions in my environment.Here's the stack trace as well from the reporting services error log...lots
of errors about the connection pool?
-- End of inner exception stack trace --
w3wp!webserver!1!01/24/2006-15:04:38:: e ERROR: Reporting Services error
Microsoft.ReportingServices.Diagnostics.Utilities.RSException: An error has
occurred during report processing. -->
Microsoft.ReportingServices.ReportProcessing.ProcessingAbortedException: An
error has occurred during report processing. -->
Microsoft.ReportingServices.ReportProcessing.ReportProcessingException:
Cannot create a connection to data source 'MyReports-ReportServer-PHX'. -->
System.Data.SqlClient.SqlException: Login failed for user '(null)'. Reason:
Not associated with a trusted SQL Server connection.
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException
exception, Boolean breakConnection)
at
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject
stateObj)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior,
SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet
bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean
enlistOK)
at
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection
owningObject, SqlConnectionString connectionOptions, String newPassword,
Boolean redirectedUserInstance)
at
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity
identity, SqlConnectionString connectionOptions, Object providerInfo, String
newPassword, SqlConnection owningObject, Boolean redirectedUserInstance)
at
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions
options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection
owningConnection)
at
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options)
at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection
owningObject)
at
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection
owningObject)
at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection
owningObject)
at
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection
owningConnection)
at
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection
outerConnection, DbConnectionFactory connectionFactory)
at System.Data.SqlClient.SqlConnection.Open()
at Microsoft.ReportingServices.DataExtensions.SqlConnectionWrapper.Open()
at
Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ReportRuntimeDataSourceNode.OpenConnection(DataSource
dataSourceObj, ReportProcessingContext pc)
-- End of inner exception stack trace --
at
Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ReportRuntimeDataSourceNode.Process()
at
Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RuntimeDataSourceNode.ProcessConcurrent(Object threadSet)
-- End of inner exception stack trace --
at
Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ProcessingContext.AbortHelper.ThrowAbortException(Int32 reportUniqueName)
at
Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ProcessingContext.CheckAndThrowIfAborted()
at
Microsoft.ReportingServices.ReportProcessing.ReportProcessing.Merge.Process(ParameterInfoCollection parameters, Boolean mergeTran)
at
Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ProcessReport(Report report, ProcessingContext pc, ProcessingContext context)
at
Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ProcessReport(Report
report, ProcessingContext pc, Boolean snapshotProcessing, Boolean
processWithCachedData, GetReportChunk getChunkCallback, ErrorContext
errorContext, DateTime executionTime, CreateReportChunk cacheDataCallback,
ProcessingContext& context)
at
Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderReport(IRenderingExtension
renderer, DateTime executionTimeStamp, GetReportChunk
getCompiledDefinitionCallback, ProcessingContext pc, RenderingContext rc,
CreateReportChunk cacheDataCallback, Boolean& dataCached)
at
Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderReport(DateTime
executionTimeStamp, GetReportChunk getCompiledDefinitionCallback,
ProcessingContext pc, RenderingContext rc)
at
Microsoft.ReportingServices.Library.RSService.RenderAsLive(CatalogItemContext
reportContext, ItemProperties properties, ParameterInfoCollection
effectiveParameters, Guid reportId, ClientRequest session, String
description, ReportSnapshot intermediateSnapshot, DataSourceInfoCollection
thisReportDataSources, Boolean cachingRequested, Warning[]& warnings,
ReportSnapshot& resultSnapshotData, DateTime& executionDateTime,
RuntimeDataSourceInfoCollection& alldataSources, UserProfileState&
usedUserProfile)
at
Microsoft.ReportingServices.Library.RSService.RenderAsLiveOrSnapshot(CatalogItemContext
reportContext, ClientRequest session, Warning[]& warnings,
ParameterInfoCollection& effectiveParameters)
at
Microsoft.ReportingServices.Library.RSService.RenderFirst(CatalogItemContext
reportContext, ClientRequest session, Warning[]& warnings,
ParameterInfoCollection& effectiveParameters, String[]& secondaryStreamNames)
at Microsoft.ReportingServices.Library.RenderFirstCancelableStep.Execute()
at
Microsoft.ReportingServices.Diagnostics.CancelablePhaseBase.ExecuteWrapper()
-- End of inner exception stack trace --
at
Microsoft.ReportingServices.Diagnostics.CancelablePhaseBase.ExecuteWrapper()
at
Microsoft.ReportingServices.Library.RenderFirstCancelableStep.RenderFirst(RSService
rs, CatalogItemContext reportContext, ClientRequest session, JobType type,
Warning[]& warnings, ParameterInfoCollection& effectiveParameters, String[]&
secondaryStreamNames)
at
Microsoft.ReportingServices.WebServer.ReportServiceHttpHandler.RenderReport(HttpResponseStreamFactory streamFactory)
at
Microsoft.ReportingServices.WebServer.ReportServiceHttpHandler.DoStreamedOperation(StreamedOperation operation)
at
Microsoft.ReportingServices.WebServer.ReportServiceHttpHandler.RenderItem(ItemType itemType)
at
Microsoft.ReportingServices.WebServer.ReportServiceHttpHandler.RenderPageContent()
at
Microsoft.ReportingServices.WebServer.ReportServiceHttpHandler.RenderPage()