如果错误仍然存在，请致电H P客户支持中心。
如果类路径设置正确，但是仍然看到这个错误，那么就是需要的类在类路径中不存在。
If the classpath is set correctly but you're still seeing the error, then the desired class is not present on the classpath.
如果提供了错误的敲门序列(或根本没有敲门)，会收到“Connection timed out”消息，SSH端口仍然完全关闭，看不出它是存在的。
If you provided a wrong sequence of knocks (or no knocks at all), you would receive a "Connection timed out" message, and the SSH port would remain completely closed with no sign of its existence.
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