SharePoint 2016 Apps error Authentication Required site url requires a username and password. Your connection to this site is not private

In this post, we will discuss how we can resolve the issue which comes when you try to click on any apps you have installed. Recently after configuring SharePoint 2016 on-premise environment for Apps, when I click on any app that I have installed, it navigates to the app URL but it shows error like below.

Also, read:
– Change width of list view column in SharePoint 2013 using SharePoint designer 2013

– Working with Current User Filter web part in SharePoint 2013 Online

– Office 365 Document Deletion Policies in Office 365 SharePoint Online and how to create and implement document deletion policy in Site Collection

Authentication Required.

http://myspapps-**************.mysp.localapps:29024 requires a username and password.

Your connection to this site is not private.

It looks like below:

Open SharePoint 2016 Management Shell and run below command.

New-ItemProperty HKLM:\System\CurrentControlSet\Control\Lsa -Name “DisableLoopbackCheck” -value “1” -PropertyType dword

Now it should work fine. If it did not work, just do an IISRESET and then try again.

Hope this will be helpful.