Exception caught on transport layer closing connection – 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 issue or a problem with the transport layer, causing OpenSearch to close the connection. This could be due to a faulty network cable, router, or switch, or it could be a software issue. To resolve this, you can try restarting the network devices, checking the network settings, or updating the network drivers. If the problem persists, you may need to investigate the transport layer settings in OpenSearch or consider upgrading your OpenSearch version if it’s outdated.

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

Log Context

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

        } else if (e instanceof StreamCorruptedException) {
            logger.warn(() -> new ParameterizedMessage("{}; [{}]; closing connection"; e.getMessage(); channel));
        } else {
            logger.warn(() -> new ParameterizedMessage("exception caught on transport layer [{}]; closing connection"; channel); e);
            // close the channel; which will cause a node to be disconnected if relevant


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