So with deeper investigation I learned, that in function
```
// Initializes a ACE_INET_Addr from a PORT_NUMBER and the remote
// HOST_NAME.
int
ACE_INET_Addr::set (u_short port_number,
const char host_name[],
int encode,
int address_family)
```
port will be set only in case hostname is resolved (there is no error).
So this is the reason why port is checked.
[ Full content available at: https://github.com/apache/geode-native/pull/521 ]
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