If your network has a firewall that restricts access, you'll need to make some exceptions for the signage players to function.  Below are the required entries:

Download content, application updates, remote commands: 

NTP Server to sync time

Allow connections via Remote Support

Some external integrations (such as Facebook and Twitter) will need additional exceptions for the player to reach directly to those sites.  If you need further assistance, please contact support@trudigital.net