MySQL-Cluster Backup error (no replies)

Hello,

Trying to perform an online backup I get the following error. Although increasing level log I cant find any relevant log in the system.

ndb_mgm> 3 clusterlog BACKUP=15
Executing CLUSTERLOG BACKUP=15 on node 3 OK!

ndb_mgm> 3 clusterlog ERROR=15
Executing CLUSTERLOG ERROR=15 on node 3 OK!

ndb_mgm> start backup 11
Waiting for completed, this may take several minutes
Node 3: Backup 11 started from node 1
Backup failed
* 3001: Could not start backup
* Backup abortet due to node failure: Permanent error: Internal error
ndb_mgm> Node 3: Forced node shutdown completed. Occured during startphase 0. Initiated by signal 11.
Node 2: Backup 11 started from 1 has been aborted. Error: 1326
Node 2: Forced node shutdown completed. Occured during startphase 0. Initiated by signal 11.


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ndb_1_cluster.log:

2012-07-28 14:48:19 [MgmtSrvr] INFO -- Node 3: Backup 11 started from node 1
2012-07-28 14:48:25 [MgmtSrvr] ALERT -- Node 1: Node 3 Disconnected

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#show

[ndbd(NDB)] 2 node(s)
id=2 @172.16.13.31 (mysql-5.5.25 ndb-7.2.7, Nodegroup: 0)
id=3 @172.16.13.32 (mysql-5.5.25 ndb-7.2.7, Nodegroup: 0, Master)

[ndb_mgmd(MGM)] 1 node(s)
id=1 @172.16.13.30 (mysql-5.5.25 ndb-7.2.7)

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The default values of the parameters BackupDataBufferSize, BackupLogBufferSize, BackupMemory, BackupWriteSize and BackupMaxWriteSize are not changed.

Thanks,