Connection closed during ssl handshake – How to solve related issues

Average Read Time

2 Mins

Connection closed during ssl 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 can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Connection closed during ssl handshake ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: plugin.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

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

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


Run the Check-Up to get a customized report like this:

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