Exchange management Powershell Error Message: The WSMan client cannot process the request. Proxy is not supported under HTTP transport.

Exchange management Powershell Error Message:

New-PSSession : 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. For more information, see the
about_Remote_Troubleshooting Help topic.
+                 & $script:NewPSSession `
    + CategoryInfo          : OpenError: (System.Manageme....RemoteRunspace:RemoteRunspace) [New-PSSession], PSRemotin
   gTransportException
    + FullyQualifiedErrorId : AccessDenied,PSSessionOpenFailed
Exception calling "GetSteppablePipeline" with "1" argument(s): "No session has been associated with this implicit
remoting module"
+             $steppablePipeline = $scriptCmd.GetSteppablePipeline($myInvocation.C ...
+     + CategoryInfo          : NotSpecified: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : RuntimeException

 Solution:

• Verify the session state using the powershell command  - Get-Pssession | fl The value are  All, Opened, Disconnected, Closed, and Broken.
• Remove the broken powershell session using the command - remove-pssession -id 1
• Check the internet proxy setting - Go to internet Explorer - Tools - Internet Options - Connections - Lan Settings
• Verify the netsh winhttp show proxy
• Export the registry and then delete the WinHttpSettings key from the registry location HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\WinHttpSettings

Ref: http://blogs.technet.com/b/exchange/archive/2010/02/04/3409289.aspx
        http://exchangeserverpro.com/exchange-2010-certificate-revocation-checks-and-proxy-settings/