Handshake failed for – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to establish a secure connection with another node due to issues with the Transport Layer Security (TLS) handshake. This could be due to incorrect or mismatched certificates, or network connectivity issues. To resolve this, ensure that all nodes have the correct and valid certificates. Also, check the network connectivity between nodes. If the issue persists, you may need to review your TLS configuration settings.

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

Log Context

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

                                protected void innerOnFailure(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(new ParameterizedMessage("handshake failed for [{}]"; thisConnectionAttempt); e);



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