Log Received plaintext traffic on an encrypted channel; closing connection – How To Solve Related Issues

Log Received plaintext traffic on an encrypted channel; closing connection – How To Solve Related Issues

Updated: Jan-20

Elasticsearch Version: 1.7-8.0

Background

To resolve issues causing many log errors you can try our Elasticsearch Check-Up it analyses ES configuration to provide actionable recommendations (no installation required) 


To troubleshoot log “Received plaintext traffic on an encrypted channel; closing connection” it’s important to understand a few problems related to Elasticsearch concepts plugin. See bellow important tips and explanations on these concepts

Log Context

Log”Received plaintext traffic on an encrypted channel; closing connection {}” classname is SecurityNetty4Transport.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         } else if (SSLExceptionHelper.isNotSslRecordException(e)) {
            if (logger.isTraceEnabled()) {
                logger.trace(
                        new ParameterizedMessage("received plaintext traffic on an encrypted channel; closing connection {}"; channel); e);
            } else {
                logger.warn("received plaintext traffic on an encrypted channel; closing connection {}"; channel);
            }
            CloseableChannel.closeChannel(channel);
        } else if (SSLExceptionHelper.isCloseDuringHandshakeException(e)) {
            if (logger.isTraceEnabled()) {
                logger.trace(new ParameterizedMessage("connection {} closed during ssl handshake"; channel); e);




Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Caught exception while handling client http traffic for one node (4 node cluster) ElasticSearch

2.45 K 

Ssl Tls On Elk Cluster  

 

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