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Blue Coat SGOS 4.x Upgrade Guide
10
Changing Between SGOS 4.x Versions
When moving from one SGOS 4.x release to another SGOS 4.x release, the system maintains all
settings. Changes made after an upgrade continue to be available after a subsequent downgrade as
long as the setting is relevant to the downgraded release.
Note: When upgrading or downgrading between versions of SGOS 4.x, copies of version-specific
configurations are not retained. Instead, all configurations created in an upgrade are retained
if the configuration is relevant to the downgrade version.
Care should be taken when using policy features introduced in a minor release. These cause
compilation errors if you fall back to a previous version of the same major release in which those
features were unsupported.
To prevent accidental fallbacks, you should remove unused system images (using the
i
nstalled_systems delete number, from the (config installed-systems) prompt).
Licensing
In SGOS 4.x, a base license is issued for SGOS 4.x functionality, regardless of whether those features
existed before SGOS 4.x or are new in SGOS 4.x.
If you upgrade from SGOS 3.x with a valid SGOS 4.x component license, the ProxySG lists the licensed
components with their expiry dates; those components that are not licensed enter a 60-day trial
period.
If you upgrade from SGOS 3.x without a valid SGOS 4.x component license, all licensable components
enter a trial period; the ProxySG attempts to download a license from the Blue Coat license download
site once a day for the duration of the SGOS 4.x trial period.
There are three types of licensable components:
• Required—The SGOS base.
• Included—Additional features provided by Blue Coat.
• Optional— If applicable, any additional purchased features.
When the license key file is created, it consists of all three components. The SGOS base is a required
component of the license key file. The following table lists the ProxySG licensable components,
categorized by type.
Table 2.2: Licensable Components
Type Component Description
Required SGOS 4 Base
The ProxySG operating system, plus base features: HTTP, FTP, TCP-Tunnel,
SOCKS, and DNS proxy. The following additional features are also included
in the base license:
Included 3rd Party Onbox
Content Filtering
Allows use with third-party vendor databases: Intersafe, Optenet, Proventia,
SmartFilter, SurfControl, Websense, and Webwasher.