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Published Jun. 30, 2025

java.net.UnknownHostException: artifacts.elastic.co

Written By

Pooja Bhambani

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Issue

  • While starting the Liferay application server, the below error is encountered in the log file:
     ERROR [Start Level: Equinox Container: 53ada45d-f96c-449b-8a58-e68855c57982][ElasticsearchConnectionManager:70] Elasticsearch sidecar could not be started. Search will be unavailable. Manual installation of Elasticsearch and activation of remote mode is recommended.
    java.lang.RuntimeException: java.net.UnknownHostException: artifacts.elastic.co
    at com.liferay.portal.search.elasticsearch7.internal.sidecar.ElasticsearchInstaller.install(ElasticsearchInstaller.java:62) ~[bundleFile:?]
    at com.liferay.portal.search.elasticsearch7.internal.sidecar.Sidecar._installElasticsearchIfNeeded(Sidecar.java:534) ~[bundleFile:?]
    at com.liferay.portal.search.elasticsearch7.internal.sidecar.Sidecar.start(Sidecar.java:93) ~[bundleFile:?]
    at com.liferay.portal.search.elasticsearch7.internal.sidecar.SidecarManager.lambda$applyConfigurations$0(SidecarManager.java:110) ~[bundleFile:?]
    at com.liferay.portal.search.elasticsearch7.internal.connection.ElasticsearchConnection.connect(ElasticsearchConnection.java:52) ~[bundleFile:?]
    at com.liferay.portal.search.elasticsearch7.internal.connection.ElasticsearchConnectionManager.addElasticsearchConnection(ElasticsearchConnectionManager.java:64) [bundleFile:?]
    at com.liferay.portal.search.elasticsearch7.internal.sidecar.SidecarManager.applyConfigurations(SidecarManager.java:117) [bundleFile:?]
    at com.liferay.portal.search.elasticsearch7.internal.sidecar.SidecarManager.activate(SidecarManager.java:63) [bundleFile:?]
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
    at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]

Environment

  • Liferay DXP 7.3
  • Liferay DXP 7.4
  • 2023.Q3
  • 2023.Q4

Resolution

  • This error usually occurs when the server is running behind a proxy or without an internet connection; in that case, Liferay isn't able to connect with artifacts.elastic.co. This same behavior can be confirmed by navigating to liferay_home > elasticsearch-sidecar, the folder will be empty.
  • Examine whether your internet connection is stable or not. If the internet connection is stable, then check if your server is running behind the proxy.
  • However, to start elasticsearch-sidecar without an internet connection, perform the following steps:
    1. Stop Liferay.
    2. Copy and paste the elasticsearch-sidecar folder (Copy this folder where elasticsearch-sidecar is running perfectly)
    3. Delete liferay_home/OSGi/state
    4. Delete liferay_home/work
    5. Delete liferay_home/tomcat/work
    6. Delete liferay_home/tomcat/temp
    7. Restart Liferay.

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