Today in this post, I will show you how to Resolve “Authentication Required” Error While Accessing An App in SharePoint 2013. When you are trying attempt to access an app and receive “Authentication Required” popup in each click then you would like to grasp whats happening. The apps and SharePoint Portal are different environments. two cannot work in same DNS and AppDomain, you would like to configure Apps to have different DNS and AppDomain by using Powershell once adding App Support to your SharePoint Portal.


Because of this AppDomain issue, you are receiving the loopback popup window named “Authentication Required”.

To solve this, there’s a workaround many people use: Regedit entry.
1. Click Windows Key + R and enter regedit or simply run regedit (all the same).

2. Locate HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa.

3. Create a new DWORD 32bit named DisableLoopbackCheck.


4. Assign its value as “1”.

5. Reboot.

6. Open the app again.

That should work and solve your issue. Hope it works for you!

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