Remote SQL Server Access

I'm using SQL Server to store session state. The Sql Server is on the local network but not on the web server. I use impersonation and use account credentials for the ASPNET worker process:

<identity impersonate="true" userName="domain\user" password="pass"/
I'm able to access all resources and execute all pages without any problem.

When an object is added to session state I recieve the following error:

"Cannot open database requested in login 'ASPState'. Login fails. Login failed for user 'domain\username. "

Here is my web.config entry for using sql server (with modified connection string of course):

<sessionState mode="SQLServer" cookieless="false" timeout="30" stateConnectionString="Data Source=xxx.xxx.x.xx,1433;Network Library=DBMSSOCN;Initial Catalog=ASPState;Integrated Security=SSPI" /
I've checked and given the user i'm impersonating the ability to do everything. I've granted access on all necessary files, added them to the DB and made the user a db_owner of the ASPState table. I can log in to a machine as the user, then access sql server using the windows authentication. I granted 'act as part of the operating system', 'access this computer from a network', 'log on as a service', 'log on as a batch job' on both the remote computer hosting sql server and the web server.

The strange thing is i installed the asp session state tables on my development machine, using the same configuration file to run everything, and was able to add an object to session state without any problem. But when i specify the remote server, i'm denied.

Anybody have an idea?Have you tried switched back from integrated and supplying the said user details in the connection string? Not suggesting that as a solution but just wondering if that works.