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

Opster Team

Aug-23, Version: 7-8.2

Briefly, this error occurs when there’s a problem with the communication between Elasticsearch and the HTTP server. This could be due to network issues, incorrect configuration, or a problem with the Elasticsearch instance itself. To resolve this issue, you can try the following: 1) Check the network connection and ensure that the Elasticsearch server is reachable. 2) Verify the configuration settings for both the HTTP server and Elasticsearch. 3) Restart the Elasticsearch instance. 4) Check the Elasticsearch logs for more detailed error messages that can help identify the root cause.

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 Elasticsearch concepts: .

Log Context

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


    protected static 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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