Failed to connect to requesting 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 the node it’s trying to reach. This could be due to network issues, incorrect configuration, or the node being down. To resolve this, you can check the network connectivity, ensure the node is running, and verify the configuration settings. If the node is part of a cluster, ensure it’s properly connected to the cluster. 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 requesting node {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: discovery, discovery-multicast, node, ping and Plugin.

Log Context

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

                                     logger.warn("failed to receive confirmation on sent ping response to [{}]"; exp; requestingNode);
                        } catch (Exception e) {
                            if (lifecycle.started()) {
                                logger.warn("failed to connect to requesting node {}"; e; requestingNode);
            } else {


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