Can't add host credentials to an ESXi host due to lockdown mode
The following these steps will resolve this error.
1.Connect to the Virtual Center or the ESXi host via the vSphere Client.
2.Click on the Configuration tab for the ESXi host.
3.Click on Edit… in the Lockdown Mode section.
4.Uncheck “Enable Lockdown Mode”.
5.In vRanger Add the Host Credentials once again.