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

Opster Team

Aug-23, Version: 7.5-8.2

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Briefly, this error occurs when there’s a network issue or a problem with the Elasticsearch node’s transport layer. This could be due to a misconfiguration, a network partition, or a heavy load on the server. To resolve this issue, you can check the server’s network connectivity, ensure the transport layer is correctly configured, and monitor the server’s load to prevent it from becoming overloaded. Additionally, check the Elasticsearch 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 ” 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 Elasticsearch concepts: .

Log Context

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

    protected static 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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