Cisco Cisco Web Security Appliance S380 Guía Del Usuario

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. 

If you need to configure a firewall setting to allow HTTP access to this address, you must configure it 
using the DNS name and not a specific IP address.

For hosting AsyncOS upgrade files, a server on the internal network must have a web server, such as 
Microsoft IIS (Internet Information Services) or the Apache open source server, which has the following 
features:

Supports the display of directory or filenames in excess of 24 characters.

Has directory browsing enabled.

Is configured for anonymous (no authentication) or Basic (“simple”) authentication.

Contains at least 350MB of free disk space for each AsyncOS upgrade image.

Cisco recommends changing the update and upgrade settings to use the Cisco update servers (using 
dynamic or static addresses) after the upgrade is complete to ensure the security service components 
continue to update automatically.

Configure a local server to retrieve and serve the upgrade files.

Download the upgrade zip file.