NetIQ AppManager 7.0.x
Error: 'Unable to validate Domain User. Could not find the domain controller for the domain.'
The 'Run As' user specified under the script properties must be a domain account.
AppManager launches the SMTPSM.exe under \ServiceMonitor (which is the SMTP/POP engine that does the work of the KS) as the domain user.
This functionality is by design.