Kibana server is not ready yet while loading kibana on web

Config

[root@centos ab7732e8a55e47edb13dc713bf18f24e]# cat /etc/elasticsearch/elasticsearch.yml | grep -v "#"
node.name: 192.168.18.200
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: 0.0.0.0
http.port: 9200
cluster.initial_master_nodes: centos
[root@centos ab7732e8a55e47edb13dc713bf18f24e]#

[root@centos ab7732e8a55e47edb13dc713bf18f24e]# cat /etc/kibana/kibana.yml | grep -v "#"

server.host: "192.168.18.200"

elasticsearch.hosts: ["http:192.168.18.200:9200"]

elasticsearch.username: "kibana"
elasticsearch.password: "pass"

elasticsearch.ssl.verificationMode: none

logging.dest: /var/logs/kibana.log
[root@centos ab7732e8a55e47edb13dc713bf18f24e]#

What version of kibana are you running? How much memory does your machine have? How long have has the process been running?