[Samba] Failed DNS update - NT_STATUS_IO_TIMEOUT

[Ricardo Pardim Claus]

Dear, 

All weekend, I realized that the Bind9 the service is stopped. 

Samba Version: 4.4.5
Named version: BIND 9.9.4-RedHat-9.9.4-29.el7_2.3 (Extended Version Support)
In my network I have 2 DC's, a primary and a secondary.
In /etc/resolv.conf each DC, I just put the DNS IP location of each DC.

I see it in the logs: 
/var/log/messages:

Sep  4 10:30:02 srv14 samba[19876]: [2016/09/04 10:30:02.360111,  0] ../source4/dsdb/dns/dns_update.c:295(dnsupdate_nameupdate_done) 
Sep  4 10:30:02 srv14 samba[19876]:  ../source4/dsdb/dns/dns_update.c:295: Failed DNS update - NT_STATUS_IO_TIMEOUT 




# systemctl status samba4

Set 04 10:40:02 srv14 samba[19876]: [2016/09/04 10:40:02.388057,  0] ../source4/dsdb/dns/dns_update.c:295(dnsupdate_nameupdate_done) 
Set 04 10:40:02 srv14 samba[19876]:   ../source4/dsdb/dns/dns_update.c:295: Failed DNS update - NT_STATUS_IO_TIMEOUT 



cat /etc/resolv.conf 
nameserver 172.16.16.3 
search domain.local 
domain domain.local 


When the restart the named Samba4 and services, everything works.
Anyone know tell me how to solve the problem? 
Thank you!