gatling响应给我错误信息？

Question

Gatling senario是

  val scn = scenario("First Test Scenario").exec( Login.login )
  setUp(
    scn.inject(constantUsersPerSec(100) during(20 seconds) )
        .protocols(httpConf)
   )
  object Login{
    val login = exec(http("Login")
            .get("/auth/login")
        )
 }

它给我的错误信息： 21:24:23.863 [WARN ] i.g.h.a.ResponseProcessor - Request 'Login' failed: j.n.ConnectException: Failed to open a socket.这是什么意思？