I installed a fresh copy of dnn 5.1 and installed the AD 5 extension. I have seen numerous posts with the problem I am having but no solutions. The setup of the extension all works and when I go to http://myserver/dotnetnuke/DesktopModules/AuthenticationServices/ActiveDirectory/WindowsSignin.aspx it logs me in. But at the login screen it won't log me in. I just says "Login Failed, remember that Passwords are case sensitive"

Any Suggestions

Changing the minimum length of the password seems to have worked. When I try to do as you suggest and put in a default domain and hit update. It doesn't save it. Does the same thing for where you enter ip's for auto login. Any ideas? There are no errors when I hit update. But when I navigate away from the config and then back those updates are gone.

 I'm having the same problem

Using DNN 5.2.0

AD: 5.0.2

Login as Admin to your site.

Admin->Extensions

Under the Authentication Systems Click on the Pencil of DNN_ActiveDirectoryAuthentication.

In the Text box for "Default Domain" enter in your domain.

Click on Update Authentication Settings.

Now navigate away from this page (ie. Click on the Home tab)

Now navigate back to the page

Admin->Extensions

Under the Authentication Systems Click on the Pencil of DNN_ActiveDirectoryAuthentication.