1. make sure IIS WinRM extension is installed
2. open powershell and run command : WinRM Quickconfig
3. Open IIS go to Powershell virtual directory and check that SSL

Check and see if it's working now.

Else

5. Open Windows powershell modules

6. run Remove-PowershellVirtualDirectory command6. run New-PowershellVirtuallirectory command

7. IISreset

Possible Causes:

1. The "Require SSL" option has been enabled on the PowerShell Virtual Directory. To resolve this, remove the "Require SSL" option from this Virtual Directory. The Exchange Management Tools connect over port 80, not 443, so if Require SSL is set, when a connection is attempted on port 80, IIS will return a 403 error indicating SSL is required.