Graylog web interface can not reach?

Graylog Central (peer support)
1

Deal all,
I have a question that how can confirm graylog web interface service ?
I install the graylog with the graylog ovf but i do know why i can not reach the web ?

2

he @Anson

you might want to check your Graylog server.log for more information.

3

Hi Jan,
I look the server.log , here are my error log detail, how can i resolve it?

2020-03-25T14:36:03.365+08:00 ERROR [Cluster] Couldn’t read cluster health for indices [graylog_, gl-events_, gl-system-events_*] (Could not connect to http://xxx.xxx.xxx.xxx:9200)
2020-03-25T14:36:03.366+08:00 INFO [IndexerClusterCheckerThread] Indexer not fully initialized yet. Skipping periodic cluster check.

4

start elasticsearch?

it looks like that is not running.