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Error "Could not connect to registration server" when trying to download rules for the first time.

The ESM reaches out to when downloading rules for the first time.

Ensure DNS is properly setup on the ESM to resolve

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.

ePO Support Center Plug-in
Check out the new ePO Support Center. Simply access the ePO Software Manager and follow the instructions in the Product Guide for the most commonly used utilities, top known issues announcements, search the knowledgebase for product documentation, and server status and statistics – all from within ePO.