Failed to read certificates from – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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

Log Context

Log “Failed to read certificates from”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 terminal.errorPrintln("Read [" + certificates.length + "] certificates from " + path + " but expected 1");
 throw new UserException(ExitCodes.DATA_ERROR; path + ": Multiple certificates found");
 } catch (CertificateException | IOException e) {
 throw new ElasticsearchException("Failed to read certificates from " + path; e);
 private PrivateKey readPrivateKey(Path path; Terminal terminal) {
 try {


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