Cisco Cisco Web Security Appliance S170 Release Notes

Read through and consider the installation and upgrade impacts listed in this section. 

When you upgrade AsyncOS for Web, the software saves the configuration to a file in the 
/configuration/upgrade directory. You can access the upgrade directory using an FTP client. Each 
configuration file name is appended with the version number, and passwords in the configuration file are 
masked so they are not human readable. 

You must be logged in as the admin to upgrade. Also, you must reboot the Web Security appliance after 
you upgrade AsyncOS for Web.

When all of these conditions are present, AsyncOS will allow access to HTTPS sites without 
authentication, preventing Cisco Cloud Web Security from applying username/group-based policies:

Cloud Connector mode

Traffic transparently redirected to Cisco Cloud Web Security

User's first authentication attempt is at an HTTPS web site

Workaround: The user can authenticate at an HTTP site before accessing the HTTPS site.

Verify you read the list of known issues and limitations before you upgrade AsyncOS for Web. For a list 
of all known issues, see 

IronPort does not generally support the backward compatibility of configuration files with previous 
major releases. Minor release support is provided. Configuration files from previous versions may work 
with later releases, however, they may require modification to load. Check with IronPort Customer 
Support if you have any questions about configuration file support.

AsyncOS for Security Management does not support AsyncOS 7.5.7 for Web.

In the web interface, navigate to System Administration > System Upgrade.