Failed to initialize a TrustManagerFactory – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.17

Briefly, this error occurs when Elasticsearch is unable to initialize a TrustManagerFactory, which is responsible for managing SSL/TLS connections. This could be due to incorrect or missing SSL configurations, or issues with the Java Keystore. To resolve this, ensure that your SSL configurations are correct and that the Java Keystore is properly set up. Also, check if the necessary SSL certificates are correctly installed and valid. If the problem persists, consider updating or reinstalling your Java Runtime Environment as it might be causing the issue.

This guide will help you check for common problems that cause the log ” failed to initialize a TrustManagerFactory ” 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 initialize a TrustManagerFactory” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 X509ExtendedTrustManager createTrustManager(@Nullable Environment environment) {
 try {
 Certificate[] certificates = getCertificateChain(environment);
 return CertParsingUtils.trustManager(certificates);
 } catch (Exception e) {
 throw new ElasticsearchException("failed to initialize a TrustManagerFactory"; e);
 }  @Override
 List filesToMonitor(@Nullable Environment environment) {


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