Failed to resolve host – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

Briefly, this error occurs when Elasticsearch cannot resolve the hostname for the target host. This could be due to DNS resolution issues or issues with the host’s network configuration. You will need to resolve the issue with the host’s network configuration to resolve this error.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Failed to resolve host ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: node.

Log Context

Log “Failed to resolve host”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

InetAddress[] hostAddresses;
 List profileBindHosts = profileSettings.bindHosts;
 try {
 hostAddresses = networkService.resolveBindHostAddresses(profileBindHosts.toArray(Strings.EMPTY_ARRAY));
 } catch (IOException e) {
 throw new BindTransportException("Failed to resolve host " + profileBindHosts; e);
 if (logger.isDebugEnabled()) {
 String[] addresses = new String[hostAddresses.length];
 for (int i = 0; i < hostAddresses.length; i++) {
 addresses[i] = NetworkAddress.format(hostAddresses[i]);


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