When using DNN with AD and impersonate enabled we've discovered that when linking to a page with querystring information, the querystring information is chopped off during the login process.

When you first hit the site the AuthenticationModule.vb->OnAuthenticateRequest() method is fired. It then redirects the user using the following:

url = "/Admin/Security/WindowsSignin.aspx?tabid=" & _portalSettings.ActiveTab.TabID.ToString

The tabid is persisted but any qs information is lost.

The AuthenticationLogon() method is then hit in the AuthenticationController.vb class. Near the bottom of this method it then recreates the url to redirect back to using:

Dim strURL As String = NavigateURL(_portalSettings.ActiveTab.TabID, "", "logon=windows")

I can make this work by editing these two methods but it would be nice if this could become part of the core in the future.