PowerShell error ( -Concatenate -Force)


I have just installed the RSAT on a Windows 8.1.
To be able to managed servers, I had to add the following ps command to Windows 8:

 "Set-Item wsman:\localhost\Client\TrustedHosts  -Concatenate -Force"

This command returns an error, & I have no clue why it is wrong, the error is:

"Set-Item : This command cannot be used because the parameter Value is not supplied. Check the value again and run your command"

I have followed by the letter 2 differents tutorials, could you please help?

One of the tutorial is:

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You didn't tell Set-Item to what to concatenate the current value of TrustedHosts with.
The -Value argument got lost in the page, but is still visible in the screenshot: http://www.vkernel.ro/blog/wp-content/uploads/2013/01/Add-2012-Servers-to-Server-Manager-19.gif
Set-Item -Path wsman:\localhost\Client\TrustedHosts -Value ServerName -Concatenate -Force

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defreyAuthor Commented:
still no luck!!!

here my line:

Set-Item wsman:\localhost\Client\TrustedHosts pcname-Concatenate -Force

error is:

Set-Item access is denied

Any ideas?

You need to run this from an elevated PS console.
defreyAuthor Commented:
There is always something :-)

Thanks, it worked!
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