Hi, lately the domain controller freezes when some editing to the GPO occur. I think the problem has been present since the schema was upgraded to update from W2K3 SE to W2K3 R2 EE. The server that acts as a domain controller also hosts DHCP, DNS as well as Active Directory services. When the server "freezes" the logon screen (the Ctl+Alt-Del screen) dissappears from the screen, so logging in locally becomes impossible, terminal server connections (remote desktop) also hang, but DNS and DHCP services continue to run, Active Directory stops to a screeching halt. There's only one DC at the moment, but the issue was present when there were two DCs active. The server has all the primary roles, and is a global catalog server. Any hints on where i should look at? Thanks a lot in advance.