Some time back I had an issue while I tried to connect my Vcenter from powercli but unable to connect and getting below error  ################################################## Connect-VIServer :  6/08/2015 3:31:27 AM        Connect-VIserver          Could not connect using the requested protocol. At line:1 char:1 + Connect-VIServer itvc001.age.com +         + CategoryInfo               : ObjectNotFound: (:) [Connect-VIserver], ViServerConnectionException         + FullyQualifiedErrorId : Client20_ConnectivityServiceImpl_Reconnect_ProtocolError, VMware.VimAutomation.ViCore.Cmd     lets.Commands.ConnectVIServer ################################################## This is all because, there are proxy setting configured into your explorer or into your system fr...