cancel_remote (Net::SSH::Service::Forward)

         # File lib/net/ssh/service/forward.rb, line 146
    146:     def cancel_remote(port, host="127.0.0.1")
    147:       session.send_global_request("cancel-tcpip-forward", :string, host, :long, port) do |success, response|
    148:         if success
    149:           @remote_forwarded_ports.delete([port, host])
    150:         else
    151:           raise Net::SSH::Exception, "could not cancel remote forward request on #{host}:#{port}"
    152:         end
    153:       end
    154:     end