端口号为0意味着系统在绑定操作时选择一个临时端口。
A port number of zero will let the system pick up an ephemeral port in a bind operation.
这意味着阻塞这个临时端口上的外发通信会阻断诸如ssh之类的常用客户机程序。
This means that blocking outbound communication on ephemeral ports will break commonly used client programs such as SSH.
缺省情况下，ORB 侦听器端口是在运行时从平台的临时端口范围中动态地确定的。
ORB listener ports are, by default, dynamically determined from the platform’s ephemeral port range at run time.
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