Hello. Not sure how to describe this adequately and quickly, but in short it seems like our primary 2008 AD server is causing network problems. We have 3 authority servers on the network, and the one we call "primary" is the one that we upgraded from 2003 to 2008 and used as our main AD server to upgrade the network about 18 months ago. We have noticed weird things on and off for the last 6 months, where RDP sessions would suddenly drop, and server/clients whose network connection would show the yellow ! and say "no internet connectivity" or "limited connectivity", and we'd have to reboot them once or twice and then it would work. Last night, however, the entire network was affected by whatever it is. We ended up shutting down the entire network and restarting everything one at a time. We found that when we kept our primary off, but turned on an older 2003 authority server, the network works. Problem is that now our main DHCP/DNS server (the primary) is down, so DHCP doesn't work. So - we need some help in figuring out 2 things - 1) how can we get DHCP up on a 2nd machine? I do have DHCP installed on another authority server but the service is not running. (how can I sync it so it's handing out IPs accurately?). and 2) How do I go about troubleshooting the primary AD machine? Thanks a lot for your help.