SSRS 2005 Doesn't Know Me

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http://serverfault.com – I can't seem to resolve this error An error has occurred during report processing. (rsProcessingAborted) Cannot create a connection to data source 'MyDataSource'. (rsErrorOpeningConnection) Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'. I am running SSRS 2005 and the Website on a Windows Server 2003R2 x64 box joined to a domain. The report in question connects to a Windows Server 2008R2 (non domain controller) box running SQL 2008R2. When running the report locally on the SSRS box: http://localhost/ReportServer/Pages/ReportViewer.aspx?%2fMyReport&rs%3aC... the rep (HowTos)