Exception from server channel caught on transport layer – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when there’s a network communication issue between the nodes in an OpenSearch cluster. This could be due to network instability, firewall blocking, or incorrect configuration. To resolve this, ensure that all nodes are reachable and there’s no network instability. Check firewall settings to ensure necessary ports are open for communication. Also, verify the configuration files for any errors. If the issue persists, consider restarting the nodes or the entire cluster.

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This guide will help you check for common problems that cause the log ” exception from server channel caught on transport layer [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .

Log Context

Log “exception from server channel caught on transport layer [{}]” classname is TcpTransport.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    protected void onServerException(TcpServerChannel channel; Exception e) {
        if (e instanceof BindException) {
            logger.debug(() -> new ParameterizedMessage("bind exception from server channel caught on transport layer [{}]"; channel); e);
        } else {
            logger.error(new ParameterizedMessage("exception from server channel caught on transport layer [{}]"; channel); e);

    protected void serverAcceptedChannel(TcpChannel channel) {
        boolean addedOnThisCall = acceptedChannels.add(channel);


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