User Configuration\Administrative Templates\Windows Components\Internet Explorer
Specifies that Automatic Detection will be used to configure dial-up settings for users.
Automatic Detection uses a DHCP (Dynamic Host Configuration Protocol) or DNS (Domain Name System) server to customize the browser the first time it is started.
If you enable this policy, users' dial-up settings will be configured by Automatic Detection.
If you disable this policy or do not configure it, dial-up settings will not be configured by Automatic Detection, unless specified by the user.