I have been trying to export some VMs from my home lab to my public cloud provider, however when I tried to select a cloud I received the error that the vCloud Connector Node was not available. After logging into the vCloud Connector server, I could see both nodes were down.
I had enabled the firewall on both my public clouds yesterday, so I realised I had blocked the ports that the vCloud Connector Node uses to talk to the vCC server and other nodes. So I wondered which ports needed to be enabled. Reading through the vCloud Installation and Configuration guide for vCC 1.5.0 there is a great diagram on page 37 that explains the end to end data flow.
As you can see by the diagram above the vCloud Connector Nodes talk on port 8443. You need to open this port at both sides, your private cloud and your public cloud. Using my public cloud provider portal I enabled the required port and pointed to the internal IP of the vCC node.
After logging into the vCloud Connector server and refreshing the page I can now see that my public cloud nodes are both up and available again.