Failed to connect to node – How to solve related issues

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Failed to connect to node – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Failed to connect to node ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: cluster and node.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

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


Run the Check-Up to get a customized report like this:

Analyze your cluster