We have mixture of Windows server 2012 and 2008 in our enviornment, Our DHCP has VLANs and from last few weeks windows 7 clients computer name entries are not populating in DNS servers. DHCP is setup to always update dynamic A and PTR records in DNS servers. I have tried refereshing DHCP credentials for Domain Admin in advanced tab but no luck. We have not installed any windows updates for last few months and no change has been made recently on server roles.
Any ideas why it would be a problem all of a sudden.