Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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.

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. 

From the CLI, Issue the 

revert

 command.

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.