what ports to open between Connection broker and Web access hosts

I have setup a 4 node 2008 R2 RDS farm (1 connection broker, 1 Web access, and 2 session hosts.) They were all built from the same image, but the web access and connection broker will not talk to each other. They are all on the same subnet, and ips are x.x.x.200-203 The Web access server can ping the Sesions hosts, the session hosts can ping each other, web access and the connection broker. But the Web access and Connection broker cant ping each other. I turned off the windows firewall and they can ping, and connect... So whats ports does it need open?

 Thanks!