This issue occurs if:
- You have vCenter Server running in a virtual machine with two hosts configured in DRS cluster that is set to Fully Automated mode.
- vCenter Server is connected to a port group on a distributed virtual switch (DVS).
- You add a third host to the cluster and to the DVS, which triggers vMotion of the vCenter Server virtual machine from the inventory.
- The vCenter Server virtual machine is migrated to the third host, which does not have the uplinks connected yet.
This causes the VirtualCenter Server service to stop and the vCenter Server virtual machine network to go into a disconnected state.
This issue may also occur if the vCenter Database Server is a virtual machine and is migrated to the third host, which does not have the uplinks connected yet. This causes the vCenter Server to fail to connect to its database virtual machine.