I am reposting. I hope you can understand better. The last post got messed up. 

I am having the same issue. I am doing all this in windows xp. I gave FULL permissions to ASPNET in my DNN install I also added myself and did the same thing. 

In the web.config file .... 

Instead of <!--<identity impersonate="true"/>

 <authentication mode="Windows">
</authentication>-->

tried changing to

<identity impersonate="true" username="STLMSD\myusername" password="xxxxx"/>

<!--<authentication mode="Windows">
</authentication>-->

but it will give me Parser Error Message: Unrecognized attribute 'username'. Note that attribute names are case-sensitive. And I have tried all kinds of variations for my username...ex stlmsd\myusername, myusername, STLMSD\MYUSERNAME. 

 Also tried....

 <!--<authentication mode="forms">

<forms name=".DOTNETNUKE" protection="All" timeout="60" cookieless="UseCookies" />

</authentication>

<identity impersonate="true" username="STLMSD\myusername" password="xxxxx"/>-->

<authentication mode="Windows">
</authentication>

....and I get to the login screen fine but of course won't authenticate"

And I know I have access to the AD because I was able to set it up and query it using another CMS.

Or can you point me where I can find that part about impersonation in the documentation?
Please help . Thanks!

Am I crazy in assuming that this issue is effected by this issue.

http://support.dotnetnuke.com/issue/ViewIssue.aspx?ID=9156&PROJID=2

When DNN try's to validate a username in DNN5 it uses a RegularExpressionValidator of ("^([a-zA-Z0-9_-]+)

 When the AD module creates a username its "domain\user". Mine are domain\firstname.lastname

 The Regex won't pass the \ or the .

I've just been playing with the AD module for the first time really. But I noticed that it creates the entrys in the user table of the database  for you basically automatically when a user logs in using domain\user, in my case domain\firstname.lastname.  I haven't dug into it yet but I assume because it's now using windowssignin.aspx vs login.aspx that it's not using the normal user tables to log in with?

I like this module already just need to play with it a bit. I would love for my users to be auto logged in when they are in house and attached to the domain or connected via vpn and be able to log in manually when they are at the airport or what ever. I also need users that aren't in the domain to be able to log in.

This will get me out of the username/password management business, typically i have a user that forgets their password at least 3 or 4 times a month and can't read to find the send password function.

Having a bit of trouble getting the auto log in feature to work. still get the log in screen only with the two options now.