Sniper

ok I am still stuck on this,
I have the initial shell and credentials
I then try to use Windows Powershell to invoke however i get a generic error message

WinRM cannot complete the operation. Verify that the specified computer name is valid,
that the computer is accessible over the network, and that a firewall exception for the WinRM service is enabled and
allows access from this computer. By default, the WinRM firewall exception for public profiles limits access to remote
computers within the same local subnet.

I can trace route to sniper without any issues and can ping.

either I am trying something wrong or its my attacker machine however I have tried another 3rd machine and it does the same thing so it must be something I am doing.