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c# - Application cannot open SQL connection when on IIS

I have a connection string that looks like this:

Server=.;Database=mydbname;Trusted_Connection=True;

This works fine when I run/debug my application using Visual Studio (IIS Express) but after deployment over IIS-8 it throws me an exception while opening connection that:

Login failed for user 'IIS APPPOOLmysite'.

I am confused why this is happening why IIS is adding its user in the middle when the database doesn't require one, and why this is not happening with IIS Express?

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You're using Trusted_Connection=True and thus the user ApplicationPoolIdentity or IIS APPPOOLmysite is supplied to SQL server.

Option 1. Give permissions to IIS APPPOOLmysite in SQL server.

Option 2. Use User Id=User_Id;Password=****** instead of Trusted_Connection=True


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