I am new to SSRS 2005, and can not solve this problem by myself. If the report server (SQL server 2005) and database are located on different servers I have a trouble and there is the error massage displayed: "An error has occurred during report processing. (rsProcessingAborted) Cannot create a connection to data source 'ATPReportsDataSource'. (rsErrorOpeningConnection) For more information about this error navigate to the report server on the local server machine, or enable remote errors " . If the report server and data base on the same server- I am able to run and preview reports just fine? What makes the difference? looking for help with this issue! Thanks to everyone.