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 can resolve issues that cause many errors.

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.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

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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