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.

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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.

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