Channels DVR firewall access

Question for developers,

So channels is working fine away from home when I have full firewall access allowed to dvr however I do like to lock my firewalls down. With that in mind I locked access down to a specific ip address but then the connection fails, I presume this is because some authentication is done at channels to authorize the user. Is there a channels IP address or subnet I can enter with my specific IP so it will work?

Hope that makes sense....