Environment
Novell ZENworks 10 Configuration Management with Support Pack 3 - 10.3 Discovery
Situation
NMAP discovery on Windows ZCM server finds non-existent devices. On the other hand, ZCM discovery running on Linux does do it correctly (only finds existing devices).
Resolution
This is fixed in version 10.3.2 - see KB 7007237 "ZENworks
Configuration Management 10.3.2 - update information and list of fixes"
which can be found at https://www.novell.com/support