My company currently has several SQL Server instances running across multiple platforms, providing backend support for hundreds of custom apps, as well as Blackberry service and company wide intranet and HR data. We just installed Windows Server 2003 SP1 to one of our production boxes, and restarted as usual, however, now all the scheduled jobs that require external data source connections are failing with this error: "Executed as user: STARsvc_data12. DTSRun: Loading... Error: -2147467259 (80004005); Provider Error: 18452 (4814) Error string: Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection. Error source: Microsoft OLE DB Provider for SQL Server Help file: Help context: 0. Process Exit Code 1. The step failed." It seems like the OS on the box is taking away all the Windows account permissions to the SQL Agent service account, which is a Windows Domain account, as well as a local Admin on that box. Microsoft doesn't have a clue what happened. Any thoughts?