Hi Mike,

I love also. i alwayys accept challenges. This is new for me.

I am working on community version of DNN.

I just followed these step.

Here's how I got AD authentication to work in 4.0.3. It's a bit roundabout (Heck, it's a LOT roundabout!), but it worked for me....
1. For a fresh install, just go to the next step. If it's an upgrade, follow Tam Tran's instructions about the database entry, and the file deletion post above. Ignore the rest.
2. In IIS, open Properties on the web site or Virtual Directory > Directory Security tab > Edit button. Uncheck "Anonymous access" and "OK" your way out.
3. In Web.config, comment OUT the Windows Authentication block. Uncomment the forms Authentication block.
4. Uncomment the "Authentication" item under .
5. Log in with admin account.
6. Go to Admin > Authentication.
7. Check "Windows Authentication?"
8. Check "Synchronize Role?" if you want AD groups sync'ed. (Don't ask me if this doesn't work. Report it as a bug to Tam Tran.)
9. Leave "Provider:" at the default. There's normally only one choice, anyway.
10. Choose "Authentication Type." "Delegation" is a good choice in most cases.
11. "Root Domain:" If you want to authenticate and get groups from the Root forest, then leave this blank. Otherwise, enter the LDAP path to your desired AD tree. Use this format: "LDAP://dc=com,dc=this,dc=that." Using "LDAP://" in the entry overcomes a bug that exists.
12. In most circumstances, you can leave "User Name" and "Password" and "Confirm Password" blank. These are supposed to be for an account that has "Read" access to the active directory. In most cases, EVERY account has read access. So leaving these blank will cause DNN to use your domain account to read the directory.
13. Click "Update." You will get an error message at the next screen. That's OK. Your entries just went into the ModuleSettings table of the database.
14. Log out, and close the browser.
15. Open Web.config, and uncomment the Windows Authentication block. Comment OUT the forms Authentication block.
16. Save web.config.
17. Open a browser and point it at the site. You should see that the "Login" link says "Logout." This indicates that you were automatically logged in using your AD account. You won't be able to do anything here but browse public pages. But in the background, a user account was created for you, like "domain\username."
18. Close the browser.
19. Open web.config. Disable Windows Authentication and enable forms Authentication. Save web.config.
20. Open a browser and point it at the site. Log in as Admin.
21. Go to Admin > User Accounts. Click the "all" link. You should see your "domain\username" account in the list.
22. Click the pencil next to that account.
23. Click "Manage Roles for this User."
24. Add this user account to the "Administrators" Role.
25. Log out, and close the browser.
26. Open web.cofig. Last time, I promise. Enable Windows Authentication and disable forms Authentication. Save web.config.
27. Open a browser and point it at the site. Now you should not only see "Logout" at the Login link, but you should also be able to use the "Admin" menu.
 

but from point 6 to 11 , i am not getting in DNN5.1.4

can you guide me what steps should i follow for windows authentication in DNN 5.1.4?

Please guide me. i am working on same from last4  day. please help me.

sorry if u got hurt by my last submit.