Connecting to remote server failed with the following error message:
The WSMan client cannot process the request. Proxy is not supported under HTTP transport. Change the transport to HTTPS and specify valid proxy information and try again.

Check the following location in the registry:HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\WinHttpSettings

In the WinHttpSettings dword entry there will be an entry to a proxy server.
Delete the entire key.

Remove-Item HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\WinHttpSettings -Recurse