GCS proxy host is unknown – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8-8.9

Briefly, this error occurs when Elasticsearch is unable to identify the Google Cloud Storage (GCS) proxy host. This could be due to incorrect configuration settings or network issues. To resolve this, ensure that the GCS proxy host is correctly configured in the Elasticsearch settings. Also, check your network connectivity to the GCS proxy host. If the issue persists, you may need to review your firewall settings to ensure that Elasticsearch can communicate with the GCS proxy host.

This guide will help you check for common problems that cause the log ” GCS proxy host is unknown. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repository-gcs, repositories.

Log Context

Log “GCS proxy host is unknown.” class name is GoogleCloudStorageClientSettings.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 try {
 proxy = proxyType.equals(Proxy.Type.DIRECT)
 ? null
 : new Proxy(proxyType; new InetSocketAddress(InetAddress.getByName(proxyHost); proxyPort));
 } catch (UnknownHostException e) {
 throw new SettingsException("GCS proxy host is unknown."; e);
 return new GoogleCloudStorageClientSettings(
 loadCredential(settings; clientName; proxy);
 getConfigValue(settings; clientName; ENDPOINT_SETTING);
 getConfigValue(settings; clientName; PROJECT_ID_SETTING);


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