Connection closed during handshake – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

Briefly, this error occurs when a connection to Elasticsearch is closed during the SSL handshake. This can happen due to network issues or incorrect SSL configuration. To resolve the issue, ensure that the SSL configuration is correct and that the network connection is stable.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Connection closed during handshake ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Connection {} closed during handshake” classname is SecurityNetty4Transport.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             CloseableChannel.closeChannel(channel);
        } else if (SSLExceptionHelper.isCloseDuringHandshakeException(e)) {
            if (logger.isTraceEnabled()) {
                logger.trace(new ParameterizedMessage("connection {} closed during ssl handshake"; channel); e);
            } else {
                logger.warn("connection {} closed during handshake"; channel);
            }
            CloseableChannel.closeChannel(channel);
        } else if (SSLExceptionHelper.isReceivedCertificateUnknownException(e)) {
            if (logger.isTraceEnabled()) {
                logger.trace(new ParameterizedMessage("client did not trust server's certificate; closing connection {}"; channel); e);




 

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