We just had a summer daylight change in US. and pc's on my network are behaving strange, some of them change time and some didn't.

My network: 2 locations both in Midwest, same time zone. Location 1: 120 pcs (windows xp & windows 200) , with 1 Active Direcotry Domain Controller on Windows 2003 Standard. A couple of windows 2000 servers (they up to date) the rest of the servers are Xen or Debian machines (all up to date) , Second location connected through OpenVPN link all pc's are running fine - but they are all connecting to our AD domain controller. Locaiton 2: 10 pcs, and a shared LAN NAS. Both of the routers/firewalls in both locations are pFsense boxes with ntp service running - but it's up to date.

Tried all the usual suspects:

• I have all the latest updates installed
• restarted them
• domain controller is running fine
• most computers are running fine
• I have only one domain controller on my network
• also my firewall serves as ntp server (pfsense) but it's up to date.
• all of the linux machines are fine since they are querying firewall / router for the time.

about 1/3 of my pcs are 1 hour behind. If I change them manually they just change back ( the way domain pc's are supposed to).

I've tried everything but I can't think of anything else to try.