Используйте это приложение http://www.netlimiter.com/, и оно перечислит все соединения/порты/адреса, которые использует любое выполнение приложения.
After a few days of searching, I found out the problem was caused by a MySQL version mismatch. We recently created tho new API nodes and installed the latest version of MySQL (5.6.11-ndb-7.3.2).
The results described in the original question occurred when trying to delete the table (stored on NDB nodes running MySQL 5.5.27-ndb-7.2.8) from one of these new servers.
The table could be deleted without trouble from an older host, also running MySQL 5.5.27-ndb-7.2.8. After downgrading the new API nodes to MySQL 5.5.31-ndb-7.2.13, these hosts no longer caused any trouble.
I hope this answer might help someone in the future.