DNN admin panel does not allows to edit

DotNetNuke is a opensource CMS based on Microsoft .NET. The Community Edition is open source. It was initially written in VB.NET, though the developers have shifted to C# since version 6.0. It provides features to designing, building and managing rich sites and communities fast, easy and cost-effective. DNN website hosting has been popular amongst developers & end users as it provides ease to manage your website at few clicks.

The DNN websites have not been updating properly lately. Even when you enter the right admin login information, it continues to ask for it.

Authentication Required:
the server http://domain.com :80 requires username and password
You will receive such error on latest DNN versions you install on the domain. Modifying web.config under httpdocs folder will apply a fix to it.
Find for “system.webserver” & add below line just below it.
< modules runallmanagedmodulesforallrequests=”true” >
Save the file & try editing the pages as admin. Voila !