Symantec Installation Manager is configuring Symantec Management Platform. And the last step of this process if the Symantec Management Agent push to the SMP Server.
SIM 8.1 RU4, SMP 8.1
"Configuring task 7 of 63: Configure Notification Server - Push SMA to local server","Symantec.Installation.Automation.Output.ReportInfo","SymantecInstallationManager.exe",
Symantec Management Agent installed (AEXNSC.exe) is unable to start.
a. Make sure that the AeXNSC.exe is able to start manually. b. In some cases the file may be blocked by Windows. Check the properties of the file, there may be a note saying This file came from another computer and might be blocked to help protect this computer To check for and unblock the file, follow these steps:
Right-click the AeXNSC.exe file and then select Properties.
In the Generaltab, select Unblock if the option is available.