How To Solve Issues Related to Log – Failed to send external multicast response

How To Solve Issues Related to Log – Failed to send external multicast response

Updated: Feb-20

Elasticsearch Version: 1.7-8.0


Before you begin reading this guide try our beta Elasticsearch Health Check-Up it analyses JSON’s to provide personalized recommendations that can improve your clusters performance.

To troubleshoot log “Failed to send external multicast response” it’s important to understand a few problems related to Elasticsearch concepts discovery, discovery-multicast, ping, Plugin, response. See bellow important tips and explanations on these concepts

Log Context

Log”failed to send external multicast response” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                if (logger.isTraceEnabled()) {
                    logger.trace("sending external ping response {}"; builder.string());
            } catch (Exception e) {
                logger.warn("failed to send external multicast response"; e);

        private void handleNodePingRequest(int id; DiscoveryNode requestingNodeX; ClusterName requestClusterName) {
            if (!pingEnabled || multicastChannel == null) {

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Elasticsearch: Failed to connect to localhost port 9200 - Connection refused 162.35 K 93

Can't connect to ElasticSearch server using Java API   43.78 K 21

About Opster

Opster detects root causes of Elasticsearch problems, provides automated recommendations and can perform various actions to prevent issues and optimize performance

Find Configuration Errors

Analyze Now