When opening the Device > Support page, the Palo Alto Networks firewall reports a "No update information available" error and support information is not displayed.
Lack of internet connectivity to updates to paloaltonetworks.com.
The support page contains information that requires the firewall to access the Palo Alto Networks servers. If no internet access is available when opening the support page, the error will occur.
Make sure the management port (or the data port configured in Device > Setup > Services > Service Route Configuration) has internet access and can resolve DNS to updates.paloaltonetworks.com.