Do you whitelist the specific domains that the firewalls require to communicate / to download updates ... ?
At least I am doing this and I had the same error since a few days. Today I found out that some firewalls (mainly PA-200 and PA-220) no longer communicate to the url prod.itpdownloads.paloaltonetworks.com as documented here: Content Delivery Network Infrastructure
Since a few days these firewalls try to connect to proditpdownloads.paloaltonetworks.com. As soon as I opened this URL the downloads were successfull again.
So something has been BROKEN again..
I did think updates were set to the external interface on the service router, but I may have changed that after the updates were broken back in that autumn (northern hemi)... With the SR for Palo Networks set on the external interface I am picking up updates once more..
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