Hi,
Upgraded from vSphere 5.1 -> 6.0 Update 2 and I have noticed in the sessions now there are 5 connected uses using account vsphere.local\vpxd-extension-
Can someone please tell me what they are used for?
Have a look on these two KBs
.vCenter session - find origin of login
List and Disconnect vCenter Sessions - VMware PowerCLI Blog - VMware Blogs