Handshake failed unexpected remote cluster name – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.6-8.9

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Briefly, this error occurs when the remote cluster name specified in the Elasticsearch configuration does not match the actual name of the remote cluster. This could be due to a typo or a change in the remote cluster’s name. To resolve this issue, you can either change the remote cluster name in the Elasticsearch configuration to match the actual name, or change the name of the remote cluster to match the name specified in the Elasticsearch configuration. Also, ensure that the remote cluster is accessible and running.

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This guide will help you check for common problems that cause the log ” handshake failed. unexpected remote cluster name ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “handshake failed. unexpected remote cluster name” class name is ProxyConnectionStrategy.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (remoteClusterName.compareAndSet(null; remote)) {
 return null;
 } else {
 if (remoteClusterName.get().equals(remote) == false) {
 DiscoveryNode node = newConnection.getNode();
 throw new ConnectTransportException(node; "handshake failed. unexpected remote cluster name " + remote);
 return null;


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