ContextUser null on classic pool with IIS7

I set impersonation and windows on my IIS7.
But when I log on and I get an error my user context is null. I'd rather keep it on a classic pool to keep the users working on the site until I can make a full move to integration.


Anyone know what I need to do to get the HttpContext.Current.User equal to the autenticated user?


Here's a snipper from the event viewer
User host address: ::1
    User:  
    Is authenticated: False
    Authentication Type:  
    Thread account name: NT AUTHORITY\NETWORK SERVICE
 
Thread information:
    Thread ID: 8
    Thread account name: NT AUTHORITY\NETWORK SERVICE
    Is impersonating: False


Shows it's not impersonating event through I set the value.


Any help appreciated
Nick
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