Configuring DNS
If DNSDomain Name Server is not configured, Edge Cache will not work properly. That is the DNS server(s) must either be specified on Configuration > System > Network > DNS or by selecting DHCPDynamic Host Configuration Protocol on Configuration > System > Network > IPInternet protocol Address.
The user interface will not allow you to get into a state where DNS is not configured when using HTTPS Caching. For instance, if DNS is not configured, then a warning will be shown next to the HTTPS Caching section and the enable checkbox will be disabled. Also if HTTPS Caching and DNS are configured, and you attempt to remove DNS configuration, then the system will warn you and prevent you from making the change.
Caution
The system does not prevent using non-encrypted caching when DNS is not configured. In this case, the system will not warn you and Edge Cache will fail. The logs will report the issue.
To learn more about configuring DNS. See DNS and Domain Names Configuration in the main user guide.