Hey, First, my setup. We're running a Windows Server 2008 system as a PDC in a lab of about 40 PCs and 20 users. We have 1 forward zone, and three reverse zones (1 IPv4 & 2 IPv6.) As a backup, we have two other Server 2008 boxes running as secondary DNS servers. The two secondary servers also run DHCP and WDS. I have set zone transfers on the PDC to allow to any server. The problem is that every so often (randomly) DNS zone transfers are incomplete. I may have 50 records in my zone, but only 6 or 10 will actually transfer to the secondary servers. I can usually get a complete transfer by restarting the DNS service on the secondary servers followed by a manual "transfer from master"/refresh. This is happening intermittently with both forward and reverse zones. I believe the problem is on the PDC, but I am stumped at this point. Any ideas? Thanks