It indicates that you enable the yours IIS to need to enable windows authentication.
Follow the below steps it solve your problem.
Open IIS Manager (Internet Information Services)
- Right-click the web site (in case you run it locally you only have Default web site) and pick Properties.
- Choose “Directory Security” tab and click Edit on “Anonymous access and authentication control”
- In the opening window, uncheck “Allow Anonymous access” and check “Integrated Windows Authentication