I've been developing a portal in my desktop and tried to move it to a server. I did this by -

1. Backing up the database and restoring it with another name. Changed the portal alias.
2. Create a web application (win 2008), point to a directory and copy the website folder  from local to this folder.
3. Set the windowssignin.aspx to use only windows authentication.
4. Enable impersonation in IIS 7 and make it use "Authenticated" user, rather than specifying a user account. I tried specifying an account also.
5. Set all necessary permission for Network service & impersonating user.

When i try to visit the site it logs me in as the impersonating user and not as myself. What would be the problem?

I left it to forms. Please note that irrespective of whether i provide a username/pwd in impersonation or not, it does the same thing - logs me in as local system account. So its not logging me in as impersonating user. But as local system account. Now i'm confused :-(.

    <authentication mode="forms">
      <forms name=".DOTNETNUKE" protection="All" timeout="60" cookieless="UseCookies" />
    </authentication>
    <identity impersonate="true" password="" userName="" />
    <!--
    <authentication mode="Windows">
    </authentication>
    -->