Cisco Cisco Web Security Appliance S360 User Guide
21-32
Cisco AsyncOS for Web User Guide
Chapter 21 Perform System Administration Tasks
Reverting to a Previous Version of AsyncOS for Web
Reverting to a Previous Version of AsyncOS for Web
AsyncOS for Web supports the ability to revert the AsyncOS for Web operating system to a previous
qualified build for emergency uses.
qualified build for emergency uses.
Note
You cannot revert to a version of AsyncOS for Web earlier than version 7.5.
Configuration File Use in the Revert Process
Effective in version 7.5, when you upgrade to a later version, the upgrade process automatically saves
the current system configuration to a file on the Web Security appliance. (However, Cisco recommends
manually saving the configuration file to a local machine as a backup.) This allows AsyncOS for Web to
load the configuration file associated with the earlier release after reverting to the earlier version.
However, when it performs a reversion, it uses the current network settings for the management
interface.
the current system configuration to a file on the Web Security appliance. (However, Cisco recommends
manually saving the configuration file to a local machine as a backup.) This allows AsyncOS for Web to
load the configuration file associated with the earlier release after reverting to the earlier version.
However, when it performs a reversion, it uses the current network settings for the management
interface.
Reverting AsyncOS for an Appliance Managed by the SMA
You can revert AsyncOS for Web from the Web Security appliance. However, if the Web Security
appliance is managed by a Security Management appliance, consider the following rules and guidelines:
appliance is managed by a Security Management appliance, consider the following rules and guidelines:
•
When Centralized Reporting is enabled on the Web Security appliance, AsyncOS for Web finishes
transferring the reporting data to the Security Management appliance before it starts the reversion.
If the files take longer than 40 seconds to transfer to the Security Management appliance, AsyncOS
for Web prompts you to continue waiting to transfer the files, or continue the reversion without
transferring all files.
transferring the reporting data to the Security Management appliance before it starts the reversion.
If the files take longer than 40 seconds to transfer to the Security Management appliance, AsyncOS
for Web prompts you to continue waiting to transfer the files, or continue the reversion without
transferring all files.
•
You must associate the Web Security appliance with the appropriate Configuration Master after
reverting. Otherwise, pushing a configuration from the Security Management appliance to the Web
Security appliance might fail.
reverting. Otherwise, pushing a configuration from the Security Management appliance to the Web
Security appliance might fail.
Reverting AsyncOS for Web to a Previous Version
Warning
Reverting the operating system on a Web Security appliance is a very destructive action and destroys
all configuration logs and databases. Reversion also disrupts web traffic handling until the appliance
is reconfigured. Depending on the initial Web Security appliance configuration, this action may
destroy network configuration. If this happens, you will need physical local access to the appliance
after performing the reversion.
all configuration logs and databases. Reversion also disrupts web traffic handling until the appliance
is reconfigured. Depending on the initial Web Security appliance configuration, this action may
destroy network configuration. If this happens, you will need physical local access to the appliance
after performing the reversion.
Before You Begin
•
Contact Cisco Quality Assurance to confirm that you can perform the intended reversion.
•
Back up the following information from the Web Security appliance to a separate machine:
–
System configuration file (with passwords unmasked).
–
Log files you want to preserve.
–
Reports you want to preserve.