Exception from http server channel caught on transport layer channel= – 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 an issue with the communication between the OpenSearch server and the client. It could be due to network problems, server overload, or a bug in the OpenSearch software. To resolve this, you can try restarting the OpenSearch server, checking the network connection, or updating the OpenSearch software to the latest version. If the problem persists, you may need to debug the server logs for more specific issues.

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

Log Context

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


    protected void onServerException(HttpServerChannel channel; Exception e) {
        logger.error(new ParameterizedMessage("exception from http server channel caught on transport layer [channel={}]"; channel); e);

    protected void serverAcceptedChannel(HttpChannel httpChannel) {
        boolean addedOnThisCall = httpChannels.add(httpChannel);
        assert addedOnThisCall : "Channel should only be added to http channel set once";


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