Troubleshoot server errors in SharePoint "/" applications.

Server error in "/" application.

access is denied. Description: An error occurred while accessing the resources required to service this request. The server may not be configured to access the requested URL.

error message 401.2. : Unauthorized: The server configuration caused logon failure. Verify that you have permission to view this directory or page based on the credentials that you provide and the authentication methods that are enabled on the WEB server. Contact your WEB server administrator for additional assistance.

Solution--Management center--Application management--Select the current application--click--Authentication Provider--Default--pop-up page check Integrated Windows authentication

Such as

And then it's OK.

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Troubleshoot server errors in SharePoint "/" applications.