The "communication section" is in a text file on each client. Exact location depends on how the installation package was set up, but is most likely C:\Program Files\Alwil Software\Avast4\DATA
Sorry I suppose, that such basic info is not necessary to write here... :-)
example of first three rows my client file C:\Program Files\Avast4\DATA\avast4.ini
[Communication]
ServerAddress=192.168.1.111
ClientsListenPortAddress=16111
....
So it is clear, that personal firewall (Windows fw or third party fw) on clients must have a hole for port 16111 as is written in ADNM manual. You can use Group policy in Windows domain (if any) and set program exceptions for aswServ.exe and AvAgent.exe.
In the same directory is also computer.ini file, with unique GUID assigned with your computer name. When computer is cloned, not deployed via deployment task, here should be problem in communication with AMS server. But not your problem, when you deployed from as task in ADNM console (I preferred such way)