Unexpected error while pinging – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.3

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Briefly, this error occurs when OpenSearch is unable to establish a connection with a node during a routine health check, often due to network issues, firewall settings, or incorrect configuration. To resolve this, you can check your network connectivity, ensure that the firewall settings allow communication between nodes, and verify that the node’s configuration (like IP address and port) is correct. Additionally, check the OpenSearch logs for more detailed information about the error.

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This guide will help you check for common problems that cause the log ” unexpected error while pinging ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: discovery.

Log Context

Log “unexpected error while pinging” classname is UnicastZenPing.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        activePingingRounds.put(pingingRound.id(); pingingRound);
        final AbstractRunnable pingSender = new AbstractRunnable() {
            public void onFailure(Exception e) {
                if (e instanceof AlreadyClosedException == false) {
                    logger.warn("unexpected error while pinging"; e);

            protected void doRun() throws Exception {


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