Cannot read certificate – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-8.9

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Briefly, this error occurs when Elasticsearch is unable to read the SSL certificate, which is essential for secure communication. This could be due to incorrect file path, insufficient permissions, or a corrupted certificate file. To resolve this, ensure the certificate file path is correct and the file is in the right format. Check the file permissions to ensure Elasticsearch has access. If the certificate file is corrupted, you may need to generate a new one. Also, ensure the certificate is correctly configured in your Elasticsearch settings.

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This guide will help you check for common problems that cause the log ” Cannot read certificate ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Cannot read certificate” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 private List encodeCertificates(Collection certificates) {
 return certificates == null ? List.of() : -> {
 try {
 return cert.getEncoded();
 } catch (CertificateEncodingException e) {
 throw new ElasticsearchException("Cannot read certificate"; e);
 }  private List decodeCertificates(List encodedCertificates) {


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