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I hope someone can assist....

Cisco AnyConnect is blocking company Macs from seeing new Big Sur 11.6 update.

I need to provide that info to the Cisco support team to have that address whitelisted on their end.

Does anyone know where macOS updates downloads from?

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    I'd tell then not to block http://swcdn.apple.com/, https://swscan.apple.com and https://swdist.apple.com/, although there may be some others as well.
    – user3439894
    Sep 21, 2021 at 0:27

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The easy solution is to unblock 17.0.0.0/8 as one firewall rule.

Here are the details in official form.

If your firewall can only be configured with IP addresses, allow outbound connections to 17.0.0.0/8. The entire 17.0.0.0/8 address block is assigned to Apple.

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