Offhand it sounds like you're using Windows authentication instead of SQL authentication. Try removing the Integrated Security bit in the connection string and supplying a sql username and password
For example:
Data Source=myServerAddress;Initial Catalog=myDataBase;User Id=myUsername;Password=myPassword;
Check out this page for more info on SQL Server connection strings and examples:
http://www.connectionstrings.com/sql-server-2008[
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HTH, Good luck.