hello,
don't know what to do else, test all options in the forum to register workstation, no success!
we have new workstations, they can register without any trouble, but all workstation we used befor with zenworks 4 have problems!
i find in the log file some error and show here:

[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [OSTargetParser] [] [target os string = Windows XP Professional Service Pack 3 (Build 2600)] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ZenCache] [] [(Thread 30) GetObject(deviceResponse:Registration, UserContext{_LocalId=SYSTEM; _RemoteId=173b4b8120001540b4b1df0d9769908b}) called] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ZenCache] [] [(Thread 30) GetObject returning <not cached> in 0 ms] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [DeviceGuid] [] [Did not find the file deployguid.txt.] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ConnectMan] [] [================================================== =====] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ConnectMan] [] [Adapter Name: {01DFFEF6-B3DA-484A-8491-42E82C487138}] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ConnectMan] [] [Description : Realtek RTL8169/8110 Family Gigabit Ethernet NIC - Paketplaner-Miniport] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ConnectMan] [] [DHCP Server : 10.178.250.145] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ConnectMan] [] [Gateway : 10.178.250.10] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ConnectMan] [] [IP Address : 10.178.257.230] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ConnectMan] [] [================================================== =====] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [RegistrationManager] [] [DNS for address: 10.178.247.230 is WS23-052.domgp] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ZenCache] [] [(Thread 30) GetObject(PROXY_OVERRIDE, UserContext{_LocalId=none; _RemoteId=(Public)}) called] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ZenCache] [] [(Thread 30) GetObject returning <not cached> in 0 ms] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ZenCache] [] [(Thread 30) GetObject(PROXY_DEFAULT, UserContext{_LocalId=none; _RemoteId=(Public)}) called] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ZenCache] [] [(Thread 30) GetObject returning <not cached> in 0 ms] [] []
[DEBUG] [02/13/2009 11:39:12.639] [1416] [ZenworksWindowsService] [30] [] [ZenService] [] [Registering device] [] []
[DEBUG] [02/13/2009 11:41:39.967] [1416] [ZenworksWindowsService] [13] [] [Novell.Zenworks.Zmd.ExternalMessageProcessor] [] [ProcessMessages - wakeup] [] []
[DEBUG] [02/13/2009 11:38:44.061] [984] [zac] [1] [] [RemotingUtility] [] [(984)RmtUtil.Activate. No client channel...] [] []
[DEBUG] [02/13/2009 11:38:44.076] [984] [zac] [1] [] [RemotingUtility] [] [(984)RmtUtil.Activate. New clientServerPath: IPC://9fc6677c-4a95-40ad-a150-c6dcbe65e154/] [] []
[DEBUG] [02/13/2009 11:38:44.108] [984] [zac] [1] [] [RemotingUtility] [] [(984)RmtUtil.Activate. Registered server channel] [] []
[DEBUG] [02/13/2009 11:38:44.108] [984] [zac] [1] [] [RemotingUtility] [] [(984)Client channel sink created.] [] []
[DEBUG] [02/13/2009 11:38:44.279] [984] [zac] [5] [] [ZenCache] [] [ValidateSchema] [] []
[DEBUG] [02/13/2009 11:38:44.326] [984] [zac] [5] [] [ZenCache] [] [ZenCache constructor took 42 ms] [] []
[DEBUG] [02/13/2009 11:38:44.326] [984] [zac] [5] [] [ZenCache] [] [(Thread 5) GetObject(DeviceGuid.DontUseGuidDotText, UserContext{_LocalId=none; _RemoteId=(Public)}) called] [] []
[DEBUG] [02/13/2009 11:38:44.404] [984] [zac] [5] [] [ZenCache] [] [(Thread 5) GetObject returning C:\Programme\Novell\ZENworks\cache\zmd\ZenCache\a5 4a4aeb-c776-44a1-bf8a-955e7488a6ac in 74 ms] [] []
[DEBUG] [02/13/2009 11:38:44.404] [984] [zac] [5] [] [DeviceGuid] [] [GetDeviceGuid not trying guid.txt] [] []
[DEBUG] [02/13/2009 11:38:44.404] [984] [zac] [5] [] [DeviceGuid] [] [GetGuidFromServerGuidFile returned null.] [] []
[DEBUG] [02/13/2009 11:38:44.467] [984] [zac] [5] [] [SessionManager] [] [EnsureSession: Session: 999] [] []
[DEBUG] [02/13/2009 11:39:03.186] [1224] [zac] [1] [] [RemotingUtility] [] [(1224)RmtUtil.Activate. No client channel...] [] []
[DEBUG] [02/13/2009 11:39:03.202] [1224] [zac] [1] [] [RemotingUtility] [] [(1224)RmtUtil.Activate. New clientServerPath: IPC://1665cf9f-d303-4c1d-9cb6-c31d6988f916/] [] []
[DEBUG] [02/13/2009 11:39:03.233] [1224] [zac] [1] [] [RemotingUtility] [] [(1224)RmtUtil.Activate. Registered server channel] [] []
[DEBUG] [02/13/2009 11:39:03.233] [1224] [zac] [1] [] [RemotingUtility] [] [(1224)Client channel sink created.] [] []
[DEBUG] [02/13/2009 11:39:03.420] [1224] [zac] [5] [] [ZenCache] [] [ValidateSchema] [] []
[DEBUG] [02/13/2009 11:39:03.452] [1224] [zac] [5] [] [ZenCache] [] [ZenCache constructor took 42 ms] [] []
[DEBUG] [02/13/2009 11:39:03.467] [1224] [zac] [5] [] [ZenCache] [] [(Thread 5) GetObject(DeviceGuid.DontUseGuidDotText, UserContext{_LocalId=none; _RemoteId=(Public)}) called] [] []
[DEBUG] [02/13/2009 11:39:03.530] [1224] [zac] [5] [] [ZenCache] [] [(Thread 5) GetObject returning C:\Programme\Novell\ZENworks\cache\zmd\ZenCache\a5 4a4aeb-c776-44a1-bf8a-955e7488a6ac in 72 ms] [] []
[DEBUG] [02/13/2009 11:39:03.530] [1224] [zac] [5] [] [DeviceGuid] [] [GetDeviceGuid not trying guid.txt] [] []
[DEBUG] [02/13/2009 11:39:03.530] [1224] [zac] [5] [] [DeviceGuid] [] [GetGuidFromServerGuidFile returned null.] [] []
[DEBUG] [02/13/2009 11:39:03.592] [1224] [zac] [5] [] [SessionManager] [] [EnsureSession: Session: 999] [] []
[DEBUG] [02/13/2009 11:41:39.983] [1416] [ZenworksWindowsService] [13] [] [Novell.Zenworks.Zmd.ExternalMessageProcessor] [] [ProcessMessages - sleeping] [] []
[DEBUG] [02/13/2009 11:41:40.155] [1416] [ZenworksWindowsService] [17] [] [ReportAnalyzeModule] [] [CollectionPointEnabled config value: False] [] []