Failed to send ping transport message – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to communicate with other nodes in the cluster due to network issues, firewall restrictions, or incorrect configuration. To resolve this, ensure that all nodes are reachable and the network is stable. Check firewall settings to allow necessary ports for communication. Verify the configuration files for any discrepancies in the cluster settings, particularly the transport module settings. Also, ensure that the nodes are running compatible versions of OpenSearch.

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This guide will help you check for common problems that cause the log ” failed to send ping transport message ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: ping.

Log Context

Log “failed to send ping transport message” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            threadPool.scheduleUnlessShuttingDown(pingInterval; ThreadPool.Names.GENERIC; this);

        public void onFailure(Exception e) {
            logger.warn("failed to send ping transport message"; e);

        private boolean needsKeepAlivePing(TcpChannel channel) {
            TcpChannel.ChannelStats stats = channel.getChannelStats();
            long accessedDelta = stats.lastAccessedTime() - lastPingRelativeMillis;


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