I have 3 XP Pro workstations running Virtual Server 2005 with 3 DCs (1 Ops Master + 2 GCs), 1 VPN, 1 WWW, 1 DB, 1 Exchange. All the virtual servers are Windows 2003 and part of a domain (the entire domain is the 7 virtual servers and the 3 workstations). I have all 3 DCs set to use tock.usno.navy.mil for their SNTP servers, but for some reason all the servers seem to be drifting backwards towards -10 minutes. This wouldn't be a major problem except Active Directory requires a time difference of less than 5 minutes between machines. I'm sure that the workstations, VPN, WWW, DB, and Exchange boxes are drifting backwards because of the 3 DCs drifting, how can I fix this? I thought using net time /setsntp:tock.usno.navy.mil would fix it, but it doesn't. Since the 3 workstations are drifting back as well using the Virtual Server host-to-guest time sync won't help. What can I do?