Cisco Cisco Web Security Appliance S170 사용자 가이드

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.

To edit the AsyncOS update and upgrade settings:

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

 shows the options you can configure on the Edit Update Settings page.