The illustration shows that the broker is running on the same machine as the client application since the local loopback address is used.
演示表明代理和客户端应用程序运行在同一台机器上，这是因为使用了本地回环地址。
You can connect to that port only if your client application is running on the same machine and is connecting through the loopback address (localhost or 127.0.0.1).
仅当客户端应用程序运行在同一机器上并且通过环回地址(localhost或127.0.0.1)连接时才能连接到该端口。
The new addressing scheme, defined in RFC2373 (see Resources), provides a colon-separated format, where 0:0:0:0:0:0:0:1 is the loopback address equivalent to 127.0.0.1.
RFC2373（请参阅 参考资料）中所定义的新寻址方案提供了一种用冒号隔开的格式，其中 0:0:0:0:0:0:0:1是与127.0.0.1等价的回送地址。
The loopback address (127.0.0.1) is not a valid destination address.
环回地址(127.0.0.1)不是一个有效的目标地址。
The loopback address (127.0.0.1) is not a valid destination address.
环回地址(127.0.0.1)不是一个有效的目标地址。
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