Linux系统中，已安装并启动elasticsearch-8.0.0，但是网页版IP就是打不开，进程都可以查得到，排除问题过程如下：

（1）查看是否有防火墙问题，关闭防火墙后再试试IP打开。

（2）如./elasticsearch直接启动的，接下来滚动的就是启动日志信息，看报错就可以，不过以后不建议这样启动，因为当此页面关掉后，ES也会掉下来。

（3）后台启动的，./elasticsearch -d启动的，到logs文件下找到集群的日志，查看。

tail -200f my-application.log

"WARN", "message":"received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=

拒绝连接1.2.3.4:9200，但在前面增加https://1.2.3.4:9200就可以了，但正常情况是直接输入网址就可以的。所以我们到vi elasticsearch.yml标黄色部分，后面都改为false。

# ---------------------------------- Various -----------------------------------
#
# Allow wildcard deletion of indices:
#
#action.destructive_requires_name: false

#----------------------- BEGIN SECURITY AUTO CONFIGURATION -----------------------
#
# The following settings, TLS certificates, and keys have been automatically
# generated to configure Elasticsearch security features on 19-02-2022 03:19:49
#
# --------------------------------------------------------------------------------

# Enable security features
xpack.security.enabled: false

xpack.security.enrollment.enabled: false

# Enable encryption for HTTP API client connections, such as Kibana, Logstash, and Agents
xpack.security.http.ssl:
  enabled: false
  keystore.path: certs/http.p12

# Enable encryption and mutual authentication between cluster nodes
xpack.security.transport.ssl:
  enabled: false
  verification_mode: certificate
  keystore.path: certs/transport.p12
  truststore.path: certs/transport.p12
# Create a new cluster with the current node only
# Additional nodes can still join the cluster later
cluster.initial_master_nodes: ["localhost.local"]

# Allow HTTP API connections from localhost and local networks
# Connections are encrypted and require user authentication
http.host: [_local_, _site_]

# Allow other nodes to join the cluster from localhost and local networks
 

# ---------------------------------- Various -----------------------------------
#
# Allow wildcard deletion of indices:
#
#action.destructive_requires_name: false

#----------------------- BEGIN SECURITY AUTO CONFIGURATION -----------------------
#
# The following settings, TLS certificates, and keys have been automatically
# generated to configure Elasticsearch security features on 19-02-2022 03:19:49
#
# --------------------------------------------------------------------------------

# Enable security features
xpack.security.enabled: false

xpack.security.enrollment.enabled: false

# Enable encryption for HTTP API client connections, such as Kibana, Logstash, and Agents
xpack.security.http.ssl:
  enabled: false
  keystore.path: certs/http.p12

# Enable encryption and mutual authentication between cluster nodes
xpack.security.transport.ssl:
  enabled: false
  verification_mode: certificate
  keystore.path: certs/transport.p12
  truststore.path: certs/transport.p12
# Create a new cluster with the current node only
# Additional nodes can still join the cluster later
cluster.initial_master_nodes: ["localhost.local"]

# Allow HTTP API connections from localhost and local networks
# Connections are encrypted and require user authentication
http.host: [_local_, _site_]

# Allow other nodes to join the cluster from localhost and local networks

elasticsearch-8.0.0报错总结（ES）-持续更新_m0_64295612的博客-CSDN博客https://blog.csdn.net/m0_64295612/article/details/123019019