Managing Workstation server from domain server

Hello,

I am trying to manage server Foundation 2012 which is not joined to domain from domain computer. For that I need to run command:

Set-Item WSMan:localhostClientTrustedHosts -Value <YourtargetServernameHere> –Force

but I get error:

Item : This command cannot be used in the current path because this cmdlet is not supported at this level of Provider path.

But what path should be? I cannot figure it out. I dont even understand what the error exactly means. Thank you.

Pete

sfs