MSPSS: is there life after the helpdesk?

sharing solutions to uncommon IT problems

Posts Tagged ‘credentials

Dotnetnuke 7 + ActiveDirectory module: login prompt

with 3 comments


we are setting up an evolutionary prototype of Dotnetnuke which will eventually replace our current extranet portal.

I’ve setup the new, out-of-the-box DNNPro_ActiveDirectoryAuthentication module.

Everything works as expected (ie: AD users can login successfully) but often, the first time you open the website you are presented with a login prompt.


If you hit cancel, the system shows that /DesktopModules/AuthenticationServices/DNNPro_ActiveDirectory/WindowsSignin.aspx is asking for credentials.

In other words, DNN is trying to get you to automatically sign-in using your system credentials, then, when the login fails, it prompts you with a login box.

you may say: but I never asked to be logged in automatically! Neither did I and I struggled to find a reason and a solution.

In the module there’s no way to enable/disable this feature, but you can limit the automatic sign in to a range of IPs:

I simply limited the range of “allowed” IP to an unused internal ip (e.g.: and that did the trick


UPDATE: The solution I provided above was also causing a runtime error: “Index and length must refer to a location within the string. Parameter name: length”. In the end, in order to fix the problem, I had to disable auto-login altogether by commenting out the following line in the <modules> section of the web.config:

<add name=”Authentication” type=”DotNetNuke.Professional.Authentication.ActiveDirectory.HttpModules.AuthenticationModule, DotNetNuke.Professional.Authentication.ActiveDirectory” />

Written by zantoro

June 12, 2013 at 12:51 pm

Posted in DotNetNuke, IIS

Tagged with , ,