You can enable anonymous access for sites on this server or disallow anonymous access for all sites. Enabling anonymous access ...

You can enable anonymous access for sites on this server or disallow anonymous access for all sites. Enabling anonymous access allows site administrators to turn anonymous access on. Disabling anonymous access blocks anonymous users in the web.config file for this zone. Note: If anonymous access is turned off when using Forms authentication mode, Forms aware client applications may fail to authenticate correctly.