All the updates by default are through management interface unless you have configured a service route. If you are using the management interface, make sure it can reach the internet and also the DNS can resolve the updates.paloaltonetworks.com.
If you are using a layer 3 data plane interface, make sure it can reach the internet and can also resolve the updates.paloaltonetworks.com. To ensure pings are successful, enable ping using the management profile.
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