When I lose the connectivity then from DCUI restart (Management Network) and i do ping. So esxi dont fall.
If i stop the ping in few minutes lose connectivity.
MY virtual machines running on vCloud director 5.5 ,vshield 5.2 and vsphere 5.1. vShield Edge Gateway and vShield Edge have the firewall disabled.
ALl virtual wire from vshield have promiscues mode and forged transmit in accept mode