Unexpected error while pinging – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which can resolve issues that cause many errors.

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 Elasticsearch concepts: discovery and ping.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “Unexpected error while pinging” classname is UnicastZenPing.java.
We extracted the following from Elasticsearch 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 {


Watch product tour

Watch how AutoOps finds & fixes Elasticsearch problems

Analyze Your Cluster
Skip to content