如果端口已经用于其它的引擎连接，那么您就需要更改端口号或者指定一个端口的范围了。
If the port is already used for another engine connection, you will have to change the port number or specify a range of ports.
对于每个规则，您要指定一个协议、一个端口范围以及允许通过那个协议访问那些端口的一个IP地址范围。
For each rule, you specify a protocol, a range of ports, and a range of IP addresses allowed to access those ports via that protocol.
如果不需要指定端口范围，启始端口和结束端口可以是相同的端口。
The start port and the end port can be the same port when a port range is not specified.
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