A channel closed while connecting – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” a channel closed while connecting ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: node.

Log Context

Log “a channel closed while connecting”classname  is ClusterConnectionManager.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } finally {
 connection.addCloseListener(ActionListener.wrap(() -> connectionListener.onConnectionClosed(connection)));
 if (connection.isClosed()) {
 throw new ConnectTransportException(node; "a channel closed while connecting");
 return connection;


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