Cisco Cisco Web Security Appliance S160 Guia Do Utilizador

The Cisco update servers use dynamic IP addresses. If you have strict firewall policies, you may need to 
configure a static location for updates and AsyncOS upgrades. 

Contact Cisco Customer Support to obtain the static URL address.

Navigate to the System Administration > Upgrade and Update Settings page, and click Edit Update 
Settings. 

On the Edit Update Settings page, in the “Update Servers (images)” section, choose Local Update 
Servers and enter the static URL address received in step 

Verify that Cisco Update Servers is selected for the “Update Servers (list)” section.

Submit and commit your changes.

The Web Security appliance can download AsyncOS upgrades from a server within your network instead 
of obtaining upgrades directly from the Cisco update servers. When you use this feature, you download 
the upgrade image from Cisco once only, and then serve it to all Web Security appliances in your 
network.

 shows how Web Security appliances download upgrade images from local servers.

For downloading AsyncOS upgrade files, you must have a system in your internal network that has a 
web browser  and Internet access to the Cisco update servers. 

Local web server with 
access to the Internet

Cisco Update Servers

Web Security Appliances

local HTTP connections

HTTP connection to Internet through firewall