IIS/SQL-Server Error: Login failed for NT Authority Networkservice, Integrated Security

this error comes up when you change the provider or setup a new windows Server 2008/2012, then your SQL server needs the New User Login NT-AUTHORITYNetworkservice
2) when you use Integrated Security with IIS and SQL on a new Server

NT-AUTORITÄTNetzwerkdienst
Create failed for Login ‘SERVERNetzwerkdienst’. Microsoft.SqlServer.Smo