I have a CiscoWorks LMS 2.6 installation with Common Services 3.0.5, Campus Manager 4.0.7, Resource Manager 4.0.5 and Integration Utility 1.6. This CiscoWorks is running in a flat network with only one default gateway which is not a Cisco router (Enterasys). Is there a possibilty to configure the CiscoWorks that the User Tracking Utility is working correctly ? In the moment I do not see Hostnames and IP addresses ion the UT Report.
No, this will not be possible. You need at least one supported Cisco device capable of doing layer 3 routing in order to get ARP entries (and thus IP addresses and hostnames) in User Tracking.