Hi Natasha
Can you FortiNAC resolve public FQDNs from the configured DNS?
Can you try telnet test to fnac-updates.fortinet.net and updates.bradfordnetworks.com from FNAC's CLI?
You have to check the network for any type of limitation, DNS or traffic being filtered. You can also try to choose a different protocol that is used to deliver the updates if there are security policies in place.
As a last resort you can download the image to another system and proceed with the upgrade from a local SCP/TFTP server, some details can be found here.
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