When this is enabled, the login page appears as follows:
7.14 DDNS (Dynamic DNS)
Dynamic DNS provides users on the Internet a method to tie their domain name(s) to computers or servers. DDNS allows your domain name to follow your IP address automatically by having your DNS records changed when your IP address changes. Before you can enable the Dynamic DNS, you need to register an account with one of the Dynamic DNS servers that are listed in the Provider field.