Here is the error message I get when trying to configure AD authentication:

Error: Windows Authentication is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Security.Authentication.ADSI.Utilities.AddADSIPath(String Path, Path ADSIPath) at DotNetNuke.Security.Authentication.ADSI.Utilities.GetRootEntry(Path ADSIPath) at DotNetNuke.Security.Authentication.ADSI.Utilities.GetRootEntry() at DotNetNuke.Security.Authentication.ADSIProvider.GetNetworkStatus() at DotNetNuke.Security.Authentication.AuthenticationController.NetworkStatus() at DotNetNuke.Modules.Authentication.AuthenticationSettings.cmdAuthenticationUpdate_Click(Object sender, EventArgs e) --- End of inner exception stack trace ---

This web servers is NOT a member server, but I did not see that mentioned as a requirement. Can anyone send me in the right direction for resolving this?

Thanks in advance.

A server must be a Member Server, PDC, BDC or Domain Controller to use Active Directory.

Hi all,

Did you all try to change the web.config file. For mixed mode authentication....

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

and for windows authentication.....

    <identity impersonate="true"/>
    <authentication mode="Windows">
    </authentication>

Also, in IIS go to the virtual directory for DNN then click admin then Security. Then right click on "WindowsSignin.aspx". Click Properties. Then go to File Security tab. Click Edit. Check "Digest Authentication for Windows Domain Servers" and "Integrated Windows Authentication". Click Ok. again Ok.
in IE brouse to yuor website.

Cheers!

Sasmit.