Hi; can any one help me. i have 2 samba4 servers. one is PDC other ADC. PDC is master server (hostname is file2.dom.com) ADC is slave server (hostname is file.dom.com) after add a machine in domain. when i check /var/log/messages. i see DNS not update. this error comes in slave server. Jul 12 09:40:36 file named[2685]: samba_dlz: starting transaction on zone dom.com Jul 12 09:40:36 file named[2685]: client 192.253.8.25#1055: updating zone ' dom.com/NONE': update unsuccessful: pradeep-96b8ca7.dom.com/A: 'RRset exists (value dependent)' prerequisite not satisfied (NXRRSET) Jul 12 09:40:36 file named[2685]: samba_dlz: cancelling transaction on zone dom.com Jul 12 09:40:36 file named[2685]: samba_dlz: starting transaction on zone dom.com Jul 12 09:40:36 file named[2685]: client 192.253.8.25#1058: update ' dom.com/IN' denied Jul 12 09:40:36 file named[2685]: samba_dlz: cancelling transaction on zone dom.com please help me what is this issue. i am new for this -- Thanks & Regards Pradeep Pal