I have deployed and configured MySQL cluster. It works fine.

---

```
ndb_mgm> show

Connected to Management Server at: localhost:1186

Cluster Configuration

[ndbd(NDB)]2 node(s)

id=2@192.168.56.2  (mysql-5.6.19 ndb-7.3.6, Nodegroup: 0, *)

id=3@192.168.56.3  (mysql-5.6.19 ndb-7.3.6, Nodegroup: 0)

[ndb_mgmd(MGM)]1 node(s)

id=1@192.168.56.1  (mysql-5.6.19 ndb-7.3.6)

[mysqld(API)]1 node(s)

id=4@192.168.56.4  (mysql-5.6.19 ndb-7.3.6)

```

---

I am reading the manual section about how to use MySQL cluster program <http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-programs.html>

On SQL Node - 192.168.56.4, I am running: 

shell> ndb\_desc -c 192.168.56.1

I receive message: 

```
Unable to connect to management server.

NDBT_ProgramExit: 1 - Failed

```

I did ping and telnet successful to management node - 192.168.56.1:1186 from sql node - 192.168.56.4 There is no firewall between them.

What is cause of the problem ? 

Thank you in advance.