Authentication has no authenticating realm – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.2-8.9

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Briefly, this error occurs when Elasticsearch cannot find a realm to authenticate a user or request. This could be due to misconfiguration in the Elasticsearch security settings, or the specified realm does not exist. To resolve this issue, you can check your Elasticsearch configuration file (elasticsearch.yml) to ensure that the realm is correctly defined. If the realm does not exist, you need to create it. Also, ensure that the user has the necessary permissions to access the realm. If the problem persists, consider restarting Elasticsearch after making changes.

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This guide will help you check for common problems that cause the log ” Authentication {} has no authenticating realm ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Authentication {} has no authenticating realm” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 throw new ElasticsearchSecurityException("No active user");
 }  final Authentication.RealmRef ref = authentication.getEffectiveSubject().getRealm();
 if (ref == null || Strings.isNullOrEmpty(ref.getName())) {
 throw new ElasticsearchSecurityException("Authentication {} has no authenticating realm"; authentication);
 final Realm realm = this.realms.realm(authentication.getEffectiveSubject().getRealm().getName());
 if (realm == null) {
 throw new ElasticsearchSecurityException("Authenticating realm {} does not exist"; ref.getName());


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