VCSA or vCenter server appliance 6.0 root user not able to login

In VCSA 6.0 by default root cant login as root user. First login as administrator and then give administrator permission to root user.

Login vCenter vsphere client login as administrator

Username            :  “administrator@vsphere.local”

Password (root)  :  “Vmware@123” (example)

Right click vCenter –> Add permission –> role(administrator) user (root) —>ok

then try to login as root user now it will work :):)