Wazuh dashboard server is not ready yet

[reteinformatica]

Hello everyone and thank you for your interest in my problem.
I installed Wazuh for the first time in a server with Ubuntu Server 20.04 and everything went well. The problem arose after rebooting the server. Trying to access the dashboard with the browser I get this error: 'Wazuh dashboard server is not ready yet'.
I did some research and investigating a bit I realized that the 'wazuh-indexer' service does not start. This is the result of the command 'systemctl status wazuh-indexer':

**wazuh-indexer.service - wazuh-indexer
Loaded: loaded (/lib/systemd/system/wazuh-indexer.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2025-02-18 20:20:05 UTC; 1 day 23h ago
Docs: https://documentation.wazuh.com
Main PID: 3427 (code=exited, status=1/FAILURE)

Feb 18 20:20:05 vpnsvr systemd-entrypoint[3547]: Error: Could not create the Java Virtual Machine.
Feb 18 20:20:05 vpnsvr systemd-entrypoint[3547]: Error: A fatal exception has occurred. Program will exit.
Feb 18 20:20:05 vpnsvr systemd-entrypoint[3547]: at org.opensearch.tools.launchers.JvmErgonomics.flagsFinal(JvmErgonomics.java:125)
Feb 18 20:20:05 vpnsvr systemd-entrypoint[3547]: at org.opensearch.tools.launchers.JvmErgonomics.finalJvmOptions(JvmErgonomics.java:87)
Feb 18 20:20:05 vpnsvr systemd-entrypoint[3547]: at org.opensearch.tools.launchers.JvmErgonomics.choose(JvmErgonomics.java:70)
Feb 18 20:20:05 vpnsvr systemd-entrypoint[3547]: at org.opensearch.tools.launchers.JvmOptionsParser.jvmOptions(JvmOptionsParser.java:150)
Feb 18 20:20:05 vpnsvr systemd-entrypoint[3547]: at org.opensearch.tools.launchers.JvmOptionsParser.main(JvmOptionsParser.java:108)
Feb 18 20:20:05 vpnsvr systemd[1]: wazuh-indexer.service: Main process exited, code=exited, status=1/FAILURE
Feb 18 20:20:05 vpnsvr systemd[1]: wazuh-indexer.service: Failed with result 'exit-code'.
Feb 18 20:20:05 vpnsvr systemd[1]: Failed to start wazuh-indexer.**

And this is the result of the command 'systemctl start wazuh-indexer':

Job for wazuh-indexer.service failed because the control process exited with error code.
See "systemctl status wazuh-indexer.service" and "journalctl -xe" for details.

While the command 'journalctl -xe' shows this:

Feb 20 19:50:51 vpnsvr opensearch-dashboards[805]: {"type":"log","@timestamp":"2025-02-20T19:50:51Z","tags":["error","opensearch","data"],"pid":805,"message":"[>
Feb 20 19:50:54 vpnsvr opensearch-dashboards[805]: {"type":"log","@timestamp":"2025-02-20T19:50:54Z","tags":["error","opensearch","data"],"pid":805,"message":"[>
Feb 20 19:50:56 vpnsvr opensearch-dashboards[805]: {"type":"log","@timestamp":"2025-02-20T19:50:56Z","tags":["error","opensearch","data"],"pid":805,"message":"[>
Feb 20 19:50:59 vpnsvr opensearch-dashboards[805]: {"type":"log","@timestamp":"2025-02-20T19:50:59Z","tags":["error","opensearch","data"],"pid":805,"message":"[>
Feb 20 19:51:01 vpnsvr opensearch-dashboards[805]: {"type":"log","@timestamp":"2025-02-20T19:51:01Z","tags":["error","opensearch","data"],"pid":805,"message":"[>
Feb 20 19:51:04 vpnsvr opensearch-dashboards[805]: {"type":"log","@timestamp":"2025-02-20T19:51:04Z","tags":["error","opensearch","data"],"pid":805,"message":"[>
Feb 20 19:51:06 vpnsvr opensearch-dashboards[805]: {"type":"log","@timestamp":"2025-02-20T19:51:06Z","tags":["error","opensearch","data"],"pid":805,"message":"[>
Feb 20 19:51:09 vpnsvr opensearch-dashboards[805]: {"type":"log","@timestamp":"2025-02-20T19:51:09Z","tags":["error","opensearch","data"],"pid":805,"message":"[>
Feb 20 19:51:11 vpnsvr opensearch-dashboards[805]: {"type":"log","@timestamp":"2025-02-20T19:51:11Z","tags":["error","opensearch","data"],"pid":805,"message":"[>
Feb 20 19:51:14 vpnsvr opensearch-dashboards[805]: {"type":"log","@timestamp":"2025-02-20T19:51:14Z","tags":["error","opensearch","data"],"pid":805,"message":"[>

I did a lot of research and did various tests, including the one described in the “Wazuh indexer tuning” manual at this address: https://documentation.wazuh.com/current/user-manual/wazuh-indexer/wazuh-indexer-tuning.html

I even tried all suggests in this thread: #201

But everything was useless and I don't know how to do it anymore. Thank you all.