Found
http://www-01.ibm.com/support/docview.wss?uid=swg21407925 which may help.
Make sure you have only the one node agent installed on this host, if you have more than one you have installed it incorrectly and port conflicts are likely. If there are port conflicts then you can change the ports and synchronise the nodes and restart but if you identify one there is a good chance there'll be others.