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Help in configuration web service with SQL 2005


My problem follow :

I have Web Service (wrote Microsoft.Net 2003) ; Database name : Shipping (SQL server 2005)

Connection String :
ConnectionString="Data Source=localhost;Initial Catalog=Shipping;Integrated Security=SSPI;"  

Web Service is work but it is not connect database Shipping for Calculate .

Please , help me in configuration
2 Solutions
what is the account used for the web directory (iis configuration)? is it <iusr_machinename>?
integrated security=sspi tells it to use the currently logged in account (iusr_machinename) to authenticate with sql server
have you granted that user access, and to the database Shipping?
This is probably a delegation issue.
What is the exact error message ?

Does the user's credentails get passd to the SQL Server ? In that case you probably see an error that tells you that login failed for user ''. In that case you have to setup the connection to run under a special account doing an impersonation and connecting to the SQL Server.

Hope this helps ...
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