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AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Chapter 33 System Administration
Reverting to a Previous Version of AsyncOS
Caution You must have a configuration file for the version you wish to revert to. Configuration files are not
backwards-compatible.
Reverting AsyncOS on Virtual Appliances May Impact the License
If you revert from AsyncOS 9.0 for Email to AsyncOS 8.5 for Email, the license does not change.
If you revert from AsyncOS 9.0 for Email to AsyncOS 8.0 for Email, there is no longer a 180-day grace
period during which the appliance delivers mail without security features.
Feature key expiration dates do not change in either case.
Related Topics
• Virtual Appliance License Expiration, page 33-7
Reverting AsyncOS
Procedure
Step 1 Ensure that you have the configuration file for the version you wish to revert to. Configuration files are
not backwards-compatible. To do this, you can email the file to yourself or FTP the file. A simple way
to do this is to run the
mailconfig CLI command.
Step 2 Save a backup copy of the current configuration of your appliance (with passwords unmasked) on
another machine.
Note This is not the configuration file you will load after reverting.
Step 3 If you use the Safelist/Blocklist feature, export the Safelist/Blocklist database to another machine.
Step 4 Wait for the mail queue to empty.
Step 5 Log into the CLI of the appliance you want to revert.
When you run the
revert command, several warning prompts are issued. After these warning prompts
are accepted, the revert action takes place immediately. Therefore, do not begin the reversion process
until after you have completed the pre-reversion steps.
Step 6 From the CLI, Issue the revert command.
Note The reversion process is time-consuming. It may take fifteen to twenty minutes before reversion
is complete and console access to the appliance is available again.
The following example shows the
revert command:
mail.mydomain.com> revert
This command will revert the appliance to a previous version of AsyncOS.