VMware discovery no crea guests

[ColdBeer]

Tenemos una pequeña infraestructura con:

• 1 vcenter
• 4 hypervisors
• más de 70 guests

Creo un host en zabbix 2.4.2 al que añado las macros (url, username y password), y lo añado al template "Template Virt VMware".

No me crea ningún host, pero la comunicación está funcionando, pues si ejecuto:

zabbix_server -R log_level_increase="vmware collector"

Y monitorizo el log de zabbix_server, veo que detecta máquinas y discos, pero pasan las horas y nada nuevo se crea en zabbix.
Ejemplo en el log:

 7419:20141202:124923.835 In vmware_service_create_vm() vmid:'vm-2174'
  7419:20141202:124923.835 In vmware_service_get_vm_data() vmid:'vm-2174'
  7419:20141202:124923.850 End of vmware_service_get_vm_data():SUCCEED
  7419:20141202:124923.851 In wmware_vm_get_nic_devices()
  7419:20141202:124923.853 End of wmware_vm_get_nic_devices() found:1
  7419:20141202:124923.853 In wmware_vm_get_disk_devices()
  7419:20141202:124923.857 End of wmware_vm_get_disk_devices() found:1
  7419:20141202:124923.857 In vmware_service_get_vm_stats()
  7419:20141202:124923.857 In vmware_service_get_perfcounter_refreshrate()
  7419:20141202:124923.860 vmware_service_get_perfcounter_refreshrate() refresh_rate:20
  7419:20141202:124923.860 End of vmware_service_get_perfcounter_refreshrate():SUCCEED
  7419:20141202:124924.891 End of vmware_service_get_vm_stats():SUCCEED
  7419:20141202:124924.891 End of vmware_service_create_vm():SUCCEED

¿Alguna idea de qué puede estar pasando? Muchas gracias por vuestra ayuda.

[ColdBeer]

Addendum

Addendum:

Veo que, después de un tiempo, los items pertenecientes al Template Virt VMware, cambian al estado "Not supported", sin motivo aparente (el motivo que indica es "Timeout Reached").

En el log del server, al comenzar el chequeo, aparece:

 15690:20141202:172636.080 In vmware_service_update() domain.net\myuser@https://vcenter.domain.net/sdk
 15690:20141202:172636.080 In vmware_service_authenticate() 'domain.net\myuser'@'https://vcenter.domain.net/sdk'
 15690:20141202:172639.373 End of vmware_service_authenticate():SUCCEED
 15690:20141202:172639.374 In vmware_service_get_perf_counters()
 15690:20141202:172640.277 found VMware performance counter virtualDisk/read: 173
 15690:20141202:172640.277 found VMware performance counter virtualDisk/write: 174
 15690:20141202:172640.278 found VMware performance counter virtualDisk/numberReadAveraged: 171
 15690:20141202:172640.278 found VMware performance counter virtualDisk/numberWriteAveraged: 172
 15690:20141202:172640.331 found VMware performance counter net/packetsRx: 146
 15690:20141202:172640.331 found VMware performance counter net/packetsTx: 147
 15690:20141202:172640.332 found VMware performance counter net/received: 148
 15690:20141202:172640.332 found VMware performance counter net/transmitted: 149
 15690:20141202:172640.383 found VMware performance counter datastore/totalReadLatency: 182
 15690:20141202:172640.383 found VMware performance counter datastore/totalWriteLatency: 183
 15690:20141202:172640.392 End of vmware_service_get_perf_counters():SUCCEED
 15690:20141202:172640.399 In vmware_service_get_hv_list()
 15690:20141202:172642.453 End of vmware_service_get_hv_list():SUCCEED found:4
 15690:20141202:172642.454 In vmware_service_create_hv() hvid:'host-641'
 15690:20141202:172642.454 In vmware_service_get_hv_data() guesthvid:'host-641'
 15690:20141202:172642.600 End of vmware_service_get_hv_data():SUCCEED
 15690:20141202:172642.617 In vmware_service_create_datastore() datastore:'datastore-81'
 15690:20141202:172642.626 End of vmware_service_create_datastore()
 15690:20141202:172642.627 In vmware_service_create_datastore() datastore:'datastore-83'
 15690:20141202:172642.634 End of vmware_service_create_datastore()
 15690:20141202:172642.634 In vmware_service_create_datastore() datastore:'datastore-94'