Default_realm: This is the default realm to be used in communication between a client and host.
default _ realm：这是将用于客户机和主机之间的通信的默认域。
This is particularly beneficial in large latency situations such as when your host and client are on separate sides of the planet.
在大的响应时间情形下，如你的主机和客户端分布在这个星球的两端，这很大程度上是有益的。
The client principal name and client host principal name should be in the KDC database.
客户机主体名和客户机主机主体名必须在KDC数据库中。
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