Cisco Cisco Email Security Appliance C160 Mode D'Emploi

AsyncOS includes the ability to revert the AsyncOS operating system to a previous qualified build for 
emergency uses. 

Using the 

revert

 command on a appliance is a very destructive action. This command destroys all 

configuration logs and databases. Only the network information for the management interface is 
preserved--all other network configuration is deleted. In addition, reversion disrupts mail handling until 
the appliance is reconfigured. Because this command destroys network configuration, you may need 
physical local access to the appliance when you want to issue the 

revert

 command. 

You must have a configuration file for the version you wish to revert to. Configuration files are not 
backwards-compatible.

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. 

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. 

Save a backup copy of the current configuration of your appliance (with passwords unmasked) on 
another machine.

This is not the configuration file you will load after reverting.

If you use the Safelist/Blocklist feature, export the Safelist/Blocklist database to another machine.

Wait for the mail queue to empty.