I have an SBS 2011 server handling traffic for around 25 workstations. Over the last three weeks, the clients have been complaining of not being able to get online when they start in the morning. The only way they have been able to "fix" the issue is to hard reboot the server. When they attempt to log in to the server, it will log in and then lock up almost immediately. I have asked them to disconnect the NIC, give thirty seconds and then hard reboot. This allows me a reference point in the logs, because I get the following message when they unplug: "The DHCP service is not servicing any DHCPv4 clients because none of the active network interfaces have statically configured IPv4 addresses, or there are no active interfaces."
Running BPA reports no errors. I am not seeing any obvious errors in the logs for why DHCP would stop serving addresses. When I look at the workstation, the ip address given is 169.254.x.x. I try to do a /release and /renew, and it says the dhcp server timed out. I am unable to restart just the DHCP service on the server, because it locks up.