For the last 6 month I haven't had any major problems with my zenworks 10 management server until yesterday. For some reason when I go to regester a device onto the management server using zac reg http://servername It gives me a message Successfully registered with zone "[could not be determined]" and under the agent I get a:

ZENworks Server Properties
Property Value
Management Zone: Unavailable
Server DNS: Unavailable
Server Address: Unavailable

signs point to a dns issue but the workstation shows up under devices in the zenworks control center. I can also ping the server by name and ip address. Any ideas?? Fortunatly this is only effecting the roaming users as of now.