Unable to enroll node – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8-8.9

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Briefly, this error occurs when Elasticsearch is unable to add a new node to the cluster, often due to network issues, incorrect configuration, or security restrictions. To resolve this, ensure that the network connectivity between nodes is stable and secure. Check the Elasticsearch configuration files for any errors and correct them. Also, verify that the security settings allow the new node to join the cluster. If the issue persists, consider checking the Elasticsearch logs for more detailed error information.

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This guide will help you check for common problems that cause the log ” Unable to enroll node ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, node.

Log Context

Log “Unable to enroll node” class name is TransportNodeEnrollmentAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final String transportCert = Base64.getEncoder().encodeToString(transportKeysAndCertificates.get(0).v2().getEncoded());
 new NodeEnrollmentResponse(httpCaKey; httpCaCert; transportCaCert; transportKey; transportCert; nodeList)
 } catch (CertificateEncodingException e) {
 listener.onFailure(new ElasticsearchException("Unable to enroll node"; e));
 }; listener::onFailure));


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