have you looked at the tabadmin.log to see what this tells you? It could be a security thing. Did you install with full admin rights and logged in as the run-as user?
Yes, you are right! I have found out the problem: security thing! More specifically, I had put these two nodes in a same domain and I forgot to disable firewall in the worker node and I forgot, at the same time, to open ports for cluster controllers of this worker node.
Thanks a lot for your reminder!