What happens to automatic signature updates if the Firebox cannot contact a DNS server?

When the Firebox cannot contact a DNS server, it is unable to resolve the domain names required to access the signature update servers. Since automatic signature updates rely on the ability to reach these servers to download the latest signatures, the failure to contact a DNS server prevents the Firebox from locating and connecting to the update source. As a result, the updates will be unsuccessful, leading to a failure in the update process. Without functioning DNS resolution, the Firebox cannot perform the necessary steps to acquire the updates, thereby causing the automatic update mechanism to fail.