Failed to connect to node – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is unable to establish a connection with a specific node in the cluster. This could be due to network issues, incorrect configuration, or the node being down. To resolve this, you can check the network connectivity between the nodes, verify the node’s configuration settings, or ensure the node is up and running. If the node is down, you may need to restart it. Also, check the Elasticsearch logs for more detailed error information.

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

Log Context

Log “failed to connect to node [” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                try {
                } catch (Throwable e) {
                    // the fault detection will detect it as failed as well
                    logger.warn("failed to connect to node [" + node + "]"; e);

            // if we are the master; publish the new state to all nodes
            // we publish here before we send a notification to all the listeners; since if it fails


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