One or more web applications are configured to use Windows Classic authentication (SharePoint Server)

Summary: Learn how to resolve the SharePoint Health Analyzer rule "One or more web applications are configured to use Windows Classic authentication", for SharePoint Server 2016 and SharePoint 2013

Rule Name: One or more web applications are configured to use Windows Classic authentication.

Summary: This health rule is triggered when at least one Web application is configured to use Windows Classic authentication mode. Windows Classic authentication is deprecated in SharePoint Server. We recommend that you migrate to claims-based authentication, because many of the features in SharePoint Server require the claims-based authentication mode.

Cause: Web applications are configured to use Windows Classic authentication mode.

Resolution: Migrate Web applications from classic mode to claims-based authentication.