How To Solve Issues Related to Log – Exception caught on transport layer ; closing connection

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Updated: Feb-20

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Troubleshooting background

To troubleshoot Elasticsearch log “Exception caught on transport layer ; closing connection” it’s important to understand common problems related to Elasticsearch concepts: netty. See detailed explanations below complete with common problems, examples and useful tips.


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

1 Elasticsearch: exception caught on transport layer 2 9.80 K 

2 Exception Caught On Transport Layer    


Log Context

Log ” exception caught on transport layer [{}]; closing connection” classname is NettyTransport.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

                         future.getChannel().close();
                    }
                });
            }
        } else {
            logger.warn("exception caught on transport layer [{}]; closing connection"; e.getCause(); ctx.getChannel());
            // close the channel; which will cause a node to be disconnected if relevant
            ctx.getChannel().close();
            disconnectFromNodeChannel(ctx.getChannel(); e.getCause());
        }
    }






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