Failed to resolve host – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch cannot find or connect to the specified host. This could be due to incorrect hostname, network issues, or the host being down. To resolve this, first, verify the hostname is correct. If it is, check your network connection and ensure it’s stable. If the network is fine, check if the host server is up and running. If it’s down, you’ll need to restart it. If the issue persists, you may need to check your DNS settings or firewall rules that might be blocking the connection.

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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 OpenSearch concepts: .

Log Context

Log “Failed to resolve host” class name is We extracted the following from OpenSearch 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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