You probably need to re-check the permissions on the "new" server. Something is different - likely with respect to permissions - on the new box.

>Since we have changed our server, my package using connection does not work.
>The error message is the following:
>
>Error source: OLE DB Provider for SQL Server
>Erreur description: [DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied.
>
>How can I resolve the problem? Thank you!