In order to receive GSM feeds and updates you require a reachable DNS server for name resolution. In the factory default settings two Google name servers are configured:
The default DNS servers should be replace by your own DNS servers. This is especially necessary when the GSM cannot reach the Google DNS servers due to firewall rules. You can add up to three DNS servers. All changes must be confirmed by Commit.
If the DNS-servers can be reached is shown in the Readiness-Check (see section Readiness)