connection to sql server error ?

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C#

C#4.0

Hi,
The website works fine when runing it in VS.
Now I have deployed it to the dev server.
It gives error as follows:

Login failed for user 'IIS APPPOOL\F4'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\F4'.

Source Error:

...
Line 30:         DataTable dt = clsAccess.ReportsGet();
...

Do I need to give specific rights to anything?
Thanks