# File lib/net/ssh/proxy/socks4.rb, line 50
        def open(host, port)
          socket = TCPSocket.new(proxy_host, proxy_port)
          ip_addr = IPAddr.new(Resolv.getaddress(host))
          
          packet = [VERSION, CONNECT, port.to_i, ip_addr.to_i, options[:user]].pack("CCnNZ*")
          socket.send packet, 0

          version, status, port, ip = socket.recv(8).unpack("CCnN")
          if status != GRANTED
            socket.close
            raise ConnectError, "error connecting to proxy (#{status})"
          end

          return socket
        end