Currently the agents access the source and workspace files via a Windows share which was configured during the installation of the server. You will need to make sure that the agents are running under a user account that has access to this share.
For the agents to connect to the server you will need to make sure that incoming connections have been allowed on the server's port (default 9000) in any Firewall software running on the server.
For the server to connect back to the agents you will need to make sure that incoming connections have been allowed on the agent's port (default 9002) in any Firewall software running on the agents.
If you've configured an agent and it shows up in the list of available agents on the server, but does not have any properties, make sure that the firewall on the agent has been configured.