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This issue appears when the server hostname is set to "localhost".
This happened to be the default on some vps hosting services.
1. Run: hostnamectl set-hostname localhost
2. Run some tests
2a.# ping localhost
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.041 ms
2b.# host localhost
localhost has address 127.0.0.1
localhost has IPv6 address ::1
3. Run the following
var ip = System.Net.Dns.GetHostAddresses("localhost")
ip = [127.0.0.1]
ip = [100....., 192.168....., 172......]
These are all 3 the IP addresses of the network interfaces.
Note that 127.0.0.1/8 is not there.