Determining Network Requirements for Upgrades and Updates
The update servers for Cisco content security appliances use dynamic IP addresses. If you have strict firewall policies, you may need to configure a static location for AsyncOS upgrades. If you determine that your firewall settings require a static IP for upgrades, contact Cisco Customer support to obtain the required URL addresses.
Note | If you have any existing firewall rules allowing download of legacy
upgrades from upgrades.cisco.com ports such as 22, 25, 80, 4766, they will need
to be removed and/or replaced with revised firewall rules.
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