ZENworks 6.5 SP1 on Netware 6.5; Workstations: Windows XP SP2 german

If I try to remote control a workstation, I get 1487 Error. I already
checked TID 1009418. Our Workstaion naming is like WS_XYZ. I checked if the
problem could solved by renaming the Workstation in WSXYZ, but then I got
the same error. On Workstations with version 4 management agent it has

Any ideas?