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FATAL Error: listen EADDRNOTAVAIL 123.57.251.57:5601

The configuration file is configured as follows:

[root@head-kib ~]# cd /usr/local/kibana-6.5.4-linux-x86_64/config/
[root@head-kib config]# vim kibana.yml
server.port: 5601 
server.host: "123.57.251.57"
elasticsearch.url: "http://192.168.246.234:9200 "ාes node
kibana.index: ".kibana"

Because the cloud virtual machine is used, 123.57.251.57 here is the external ip. We should use the internal ip.
However, if you write localhost, although no error will be reported, port 5601 will start normally, but you will be denied access to port 5601.

[root@head-kib kibana-6.5.4-linux-x86_64]# netstat -nlp | grep 5601  #5601 port OK
tcp        0      0 127.0.0.1:5601          0.0.0.0:*               LISTEN      11188/./bin/../node 
[root@head-kib kibana-6.5.4-linux-x86_64]# curl -i http://123.57.251.57:5601
curl: (7) Failed connect to 123.57.251.57:5601; connection denied

Change ip to 0.0.0.0 and you can access it successfully.

You must kill the process occupying 5601 before restarting. Otherwise, an error will be reported, saying that port 5601 is occupied
[root@head-kib kibana-6.5.4-linux-x86_64]# netstat -nlp | grep 5601
tcp        0      0 127.0.0.1:5601          0.0.0.0:*               LISTEN      11188/./bin/../node 
[root@head-kib kibana-6.5.4-linux-x86_64]# kill -9 11188  #Kill off
[root@head-kib kibana-6.5.4-linux-x86_64]# netstat -nlp | grep 5601
[3]+  Killed               nohup ./bin/kibana
[root@head-kib kibana-6.5.4-linux-x86_64]# nohup ./bin/kibana &
[3] 26192
[root@head-kib kibana-6.5.4-linux-x86_64]# Nohup: ignore input and append output to "nohup.out"

[root@head-kib kibana-6.5.4-linux-x86_64]# tail -f nohup.out 
{"type":"log","@timestamp":"2020-04-01T04:41:25Z","tags":
["status","plugin:spaces@6.5.4","info"],"pid":26192,"state":"green","message":"Status changed from yellow to green - Ready","prevState":"yellow","prevMsg":"Waiting for Elasticsearch"}

There is no error in the log. You can visit the page again.