I am trying to get a users machine to connect to my SQL Server database, but without success. The user is defined in SQL Server, the access right is set to Windows Authentification but I get an error saying that user "(null)" has no thrusted connection. It seem that it can't read the current user login information. Here is the connection string from the config file:

<add key="ConnectionString" value="data source=SERVERTP2005;initial catalog=InvClient;
Integrated Security=SSPI;packet size=4096" />

Any ideas?

TIA