Received plaintext http traffic on a https channel; closing connection – 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 plaintext HTTP traffic is received on an HTTPS channel, which can cause security issues. To resolve this issue, you can try to configure the channel to use HTTPS, or check the network configuration for errors.

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. Take a self-guided product tour to see for yourself (no registration required).

This guide will help you check for common problems that cause the log ” Received plaintext http traffic on a https channel; closing connection ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.


Log Context

Log “Received plaintext http traffic on a https channel; closing connection {}” classname is SecurityNetty4HttpServerTransport.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         if (isNotSslRecordException(cause)) {
            if (logger.isTraceEnabled()) {
                logger.trace(new ParameterizedMessage("received plaintext http traffic on a https channel; closing connection {}";
                                ctx.channel()); cause);
            } else {
                logger.warn("received plaintext http traffic on a https channel; closing connection {}"; ctx.channel());
            }
            ctx.channel().close();
        } else if (isCloseDuringHandshakeException(cause)) {
            if (logger.isTraceEnabled()) {
                logger.trace(new ParameterizedMessage("connection {} closed during ssl handshake"; ctx.channel()); cause);




 

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