UTM 9 and a secondary DNS Server. Slave zone.

I'm installing a server to run as a secondary DNS Server of the UTM 9.
Error:
Testing transfer of slave zone from ***.***.xx.xx ..
.. from ***.***.xx.xx : Failed : ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.4 <<>> IN AXFR domain.com @ ***.***.xx.xx ;; global options: +cmd ; Transfer failed.

Using CentOS 6.3 and Bind version 9.8.2.
Edit Slave Zone. Last transferred : Never
What can be wrong ? Astaro DNS Zone Transfer problem.
Release 9.003-15 © Astaro GmbH & Co. KG 2000-2012

Regards,
John