Can't connect to MySQL Cluster Storage (data) nodes
Couple of things to check...


In your config.ini file, check that you haven't specified the host that is allowed to connect to this ndbapi slot - check the 'hostname' parameter in your config.ini file or run "ndb_mgm -e show". If you leave out the hostname parameter then you can connect the data node from any host 
Firewall. Temporarily turn off your firewall and see if that fixes it. If you need to lock down the ports used by the data nodes then set the ServerPort parameter in the [ndbd] sections or the [ndbd default] section of the config.ini file. The firewall also needs to allow port 1186 (by default) for the management node. 
You've filled up all of the API slots - run "ndb_mgm -e show" to check. If needed, add extra [mysqld] or [ndbapi] sections to your config.ini file and restart your nodes.