Please help - I am really stuggling trying to get this to work and I am running out of time......<BR><BR>I have an app that I am trying to use Windows Integrated security to access SQL databases. <BR><BR>My connection string looks like this:<BR><BR>"Server=MSSQLXX;DataBase=MYDATABASE;; Integrated Security=SSPI"<BR><BR>I have gone into IIS on my PC and set the authentication method on my app to be Windows Integrated security. (This is the only option checked.)<BR><BR>When I run my app I get the following error message :<BR><BR>Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection.<BR><BR>I know I am probably missing something fundamental on this - but the more I read about about it the more confused I am getting as to what the problem could be. All guidance is greatle appreciated!! Thank you in advance for your help.