Handshake to transportAddress failed – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch is unable to establish a connection with the specified transport address. This could be due to network issues, incorrect configuration, or incompatible versions of Elasticsearch. To resolve this, ensure that the network is functioning properly and the transport address is correct. Also, check if the Elasticsearch versions are compatible. If the problem persists, consider checking the Elasticsearch logs for more detailed error information.

This guide will help you check for common problems that cause the log ” handshake to [” + transportAddress + “] failed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: discovery.

Log Context

Log “handshake to [” + transportAddress + “] failed” classname is HandshakingTransportAddressConnector.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                        public void onFailure(Exception e) {
                            // we opened a connection and successfully performed a low-level handshake; so we were definitely
                            // talking to an Elasticsearch node; but the high-level handshake failed indicating some kind of
                            // mismatched configurations (e.g. cluster name) that the user should address
                            logger.warn(() -> "handshake to [" + transportAddress + "] failed"; e);



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