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Chapter 1: Upgrading—Overview
Blue Coat
®
strongly recommends that you read this document before attempting to upgrade to SGOS
4.x from previous ProxySG operating systems.
Existing features and policies might not perform as with previous versions, and upgrading to this
version might require some additional configuration tuning. This SGOS version provides high
security for the network, so when downgrading to previous versions, not all configurations and
policies are retained.
Changes Between SGOS 3.x and SGOS 4.x
Unlike SGOS 3.x, SGOS 4.x does not permit upgrades from SGOS 2.x or CacheOS 4.x. All systems
must be upgraded to SGOS 3.2.4 before being upgraded to SGOS 4.x. For information on the correct
upgrade path, see Table 2.1, “Upgrade Paths” on page 7.
If you attempt to download the next major release and you receive an error message saying that the
download failed due to policy deprecations, your policy uses constructs that are no longer supported
in SGOS 4.x. You must correct any policy syntax problems before upgrading.For information on
checking on policy deprecation, see "Policy Deprecation" on page 22.
If the upgrade path is followed, most of the current settings on the ProxySG are maintained after the
upgrade. New or transformed settings in SGOS 4.x are taken from the original settings wherever
possible.
About the Document Organization
This document is organized for easy reference, and is divided into the following sections and chapters:
Related Blue Coat Documentation
• Blue Coat 6000 and 7000 Installation Guide
• Blue Coat 400 Series Installation Guide
• Blue Coat 800 Series Installation Guide
• Blue Coat 8000 Series Installation Guide
Table 1.1: Document Organization
Chapter Title Description
Chapter 1 – Introducing the Upgrade/Downgrade
Guide
Upgrade differences between SGOS 3.2.x and SGOS 4.x. Blue
Coat documentation and documentation conventions are
also discussed.
Chapter 2 – Upgrade Behavior, General This chapter discusses general upgrade issues, including the
required upgrade path and licensing.
Chapter 3 – Upgrade Behavior, Specifics This chapter identifies new features in SGOS 4.x and
discusses any upgrade/downgrade issues.