None of the configured nodes were available – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.17

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Briefly, this error occurs when Elasticsearch cannot connect to any of the nodes specified in its configuration. This could be due to network issues, incorrect configuration, or the nodes being down. To resolve this, you can check the network connectivity, verify the node configuration in Elasticsearch, or ensure that the nodes are up and running. If the nodes are running in a cluster, ensure that the cluster health is green.

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This guide will help you check for common problems that cause the log ” None of the configured nodes were available: ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: client.

Log Context

Log “None of the configured nodes were available:” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 Throwable throwable = ExceptionsHelper.unwrapCause(e);
 if (throwable instanceof ConnectTransportException) {
 maybeNodeFailed(getNode(this.i); (ConnectTransportException) throwable);
 int i = ++this.i;
 if (i >= nodes.size()) {
 listener.onFailure(new NoNodeAvailableException("None of the configured nodes were available: " + nodes; e));
 } else {
 try {
 callback.doWithNode(getNode(i); this);
 } catch (final Exception inner) {


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