The ESM reaches out to www.nitroguard.com when downloading rules for the first time.
Ensure DNS is properly setup on the ESM to resolve www.nitroguard.com.
Ensure the ESM has port 80 and 443 access to the Internet.
If a Proxy server is used to access the Internet this needs to be setup in the ESM Properties -- Network Settings screen.
Download the new ePolicy Orchestrator (ePO) Support Center Extension which simplifies ePO management and provides support resources directly in the console. Learn more about ePO Support Center