Jmeter远程启动报错Following remote engines could not be configured

yunix

Agent 机型启动了jmeter-server.bat，控制机配置jmeter.properties文件，remote_hosts=XXX.XXX.X.175:62075（IP和端口直接CP Agent机的）
（Agent和控制机，的Jmeter、JDK版本是一样的，而且防火墙都关了）
控件机打开Jmeter，执行：运行——远程启动——选择上机配置的Agent。
然后报下面的错误，不知道为什么：
2016/08/08 14:57:04 ERROR - jmeter.gui.action.ActionRouter: Error processing org.apache.jmeter.gui.action.RemoteStart@491b9b8 java.lang.RuntimeException: Following remote engines could not be configured:[XXX.XXX.X.175:62075]
        at org.apache.jmeter.engine.DistributedRunner.init(DistributedRunner.java:112)
        at org.apache.jmeter.gui.action.RemoteStart.doAction(RemoteStart.java:77)
        at org.apache.jmeter.gui.action.ActionRouter.performAction(ActionRouter.java:80)
        at org.apache.jmeter.gui.action.ActionRouter.access$000(ActionRouter.java:40)
        at org.apache.jmeter.gui.action.ActionRouter$1.run(ActionRouter.java:62)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$500(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)