This is a possible fix
On vRanger server stop the following services:
- vRanger API service
- vRanger file level service
- vRanger service
Restart the services in the same order (It is imperative that you restart the services in this order):
- vRanger service
- vRanger file level service
- vRanger API service
On vCenter server stop and then start the following service (do not restart the service since it will not completely stop):
- VMware VirtualCenter Server