'hares -display -all' displays the resource in "STATEUNKNOWN". When DBG_AGTRACE and DBG_AGTRACE Agent debug options are turned on, the engine_A.log displays 'monitor script exited with status (99)' but the application monitor script actually returns correct exit status 100 or110.

2007/11/20 14:09:51 VCS DBG_4 V-16-10031-0 (esx3)GuestOSApp:itmsapp_esxVM_e2eenga01:monitor:/usr/bin/vmware-cmd getguestinfoSYMC.VCSAgent.itmsapp_esxVM_e2eenga01 returned output (VMControl error -10: The specified property or variable is invalid or undefined), retval(10)

2007/11/20 14:09:51 VCS DBG_4 V-16-10031-0 (esx3)GuestOSApp:itmsapp_esxVM_e2eenga01:monitor:Error getguestinfo : The specified property or variable is invalid or undefined

2007/11/20 14:09:51VCS WARNING V-16-10031-19007 (esx3)GuestOSApp:itmsapp_esxVM_e2eenga01:monitor:VCS Virtual Machine Tools is not reporting the state of the resource

2007/11/20 14:09:51 VCS DBG_4V-16-10031-0 (esx3) GuestOSApp:itmsapp_esxVM_e2eenga01:monitor:Monitor returning: 99

Workaround:
This is a known issue and is documented in the VCS for VMWARE ESX 5.1 release notes under Known Issues: Naming issue with VCS resources.
In some situations, VCS resources display incorrect behavior when the resource name contains a 0 followed by another number.
Workaround is to rename the resource such that it does not include a 0 followed by a number.

Example:
       ESXVirtualMachineesxVM_e2eenga01(
               CfgFile ="/vmfs/volumes/47008adf-2df0869d-d954-00145e3d9b16/e2eenga01/e2eenga01.vmx"
               VCserver=vc-server
               username=administrator
               password=bpiNjnCpfPlpGpbHbhC
               esxhostdomain="domain.com"
               vmname=e2eenga01
               )
       GuestOSAppitmsapp_esxVM_e2eenga01(
               VMwareResName=esxVM_e2eenga01
               )
Change the Resource names so that they don't have 0 followed by 1. The corrected resource names are as follows:
       ESXVirtualMachineesxVM_e2eenga1(
               CfgFile ="/vmfs/volumes/47008adf-2df0869d-d954-00145e3d9b16/e2eenga01/e2eenga01.vmx"
               VCserver=vc-server
               username=administrator
               password=drkPlpErhRnrIrdJdjE
               esxhostdomain="domain.com"
               vmname=e2eenga1
               )

       GuestOSAppitmsapp_esxVM_e2eenga1(
               VMwareResName=esxVM_e2eenga1
               )