Failed to resolve host – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.7-1.7

Briefly, this error occurs when Elasticsearch cannot find or connect to the specified host. This could be due to incorrect hostname, network issues, or DNS resolution problems. To resolve this, first, verify the hostname and ensure it’s correct. Second, check your network connection and firewall settings to ensure Elasticsearch can reach the host. Lastly, check your DNS settings to ensure the host can be resolved correctly. If the host is a remote server, ensure it’s up and running and accessible from your network.

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: bulk.

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 hostAddressX;
        try {
            hostAddressX = networkService.resolveBindHostAddress(host);
        } catch (IOException e) {
            logger.warn("failed to resolve host {}"; e; host);
        final InetAddress hostAddress = hostAddressX;

        PortsRange portsRange = new PortsRange(port);


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