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An error has occurred during report processing. Cannot create a connection to data source 'MainDataSource'.



The problem occurs if you use Microsoft SQL Server 2008 Express Edition Reporting Services installed remotely from the SQL server hosting the product database.
Solution:
This problem is caused by limited functionality of SQL Server 2008 Express Edition Reporting Services.

Note that Knowledge Portal operation on this edition of SQL Server 2008 is not supported; we strongly recommend that you follow the system requirements specified in the Knowledge Portal Installation Guide.

To allow for remote connections to the product database located on SQL Server 2008 Express Edition, you should take the following steps:

1.
Run SQL Server Configuration Manager.
2.
In SQL Server    Services, start the SQL Server Browser service.

3.
In SQL Server 2005 Network Configuration, select Protocols for SQLEXPRESS; in the protocols list, right-click the TCP/IP protocol, and from its shortcut menu select Enable.
4.
In SQL Server 2005 Services, restart the SQL Server service and SQL Server Reporting Services service by using the Restart command from their shortcut menu.
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