vRO 6.0 REST API call fails with error Exception calling "GetRequestStream" with "0" argument(s): "The underlying connection was closed: An unexpected error occurred on a send."

Hi,

I am trying to call the vRO6.0 API through Powershell and I am getting the error "Exception calling "GetRequestStream" with "0" argument(s): "The underlying connection was closed: An unexpected error occurred on a send."

I tried the same URL in the browser and I am able to see the response.

Please help me resolve this.