Which troubleshooting step should be taken to resolve antivirus and IPS update issues on FortiGate?

Validating DNS resolution for update.fortiguard.net is an essential troubleshooting step for resolving antivirus and IPS update issues on FortiGate devices. When the FortiGate device tries to retrieve updates, it needs to resolve the domain name of the update server. If the DNS resolution fails, the device will not be able to locate the update server, leading to unsuccessful attempts to download the latest antivirus and IPS signatures.

A properly functioning DNS resolution is critical for ensuring that the FortiGate device can access external resources, such as FortiGuard services, which provide the necessary updates. By checking and validating that DNS resolution to update.fortiguard.net is working correctly, administrators can determine if there are connectivity issues or misconfigurations affecting the device's ability to receive updates. This is a pivotal step in the troubleshooting process, as resolving DNS issues often leads directly to the resolution of update problems.

In contrast, while checking hardware status, rebooting the device, or manually updating the firmware might seem like potential troubleshooting steps, they do not directly address the DNS resolution process required for the FortiGate to properly access and download updates from FortiGuard. Addressing the actual communication channel and ensuring the device can resolve the update server is the most relevant and