connection refused

[Clay Teahouse]

I'd appreciate your help with this issue.
I have a server and a client node, the latter running in tomcat. I get
connection refused if I try to connect to the server node from the client,
although the server shows the client has joined the cluster. I don't have a
problem running a service on the server's service grid from the client node.
I don't have any issue connecting from any client anywhere, if the client
is not running in tomcat.
what could be the problem?