Rest realm authentication failed trealm= principal= uri= – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-6.8

Briefly, this error occurs when Elasticsearch fails to authenticate a user through the REST realm. This could be due to incorrect credentials, misconfigured realm settings, or network issues. To resolve this, you can verify the user credentials, check the realm configuration in the Elasticsearch.yml file, and ensure the network connectivity between Elasticsearch and the authentication server. Additionally, you can also check the Elasticsearch logs for more detailed error information.

This guide will help you check for common problems that cause the log ” {}[rest] [realm_authentication_failed]\trealm=[{}]; {}; principal=[{}]; uri=[{}]{} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “{}[rest] [realm_authentication_failed]\trealm=[{}]; {}; principal=[{}]; uri=[{}]{}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            if (includeRequestBody) {
      "{}[rest] [realm_authentication_failed]\trealm=[{}]; {}; principal=[{}]; uri=[{}]{}; " + "request_body=[{}]";
                        localNodeInfo.prefix; realm; hostAttributes(request); token.principal(); request.uri(); opaqueId();
            } else {
      "{}[rest] [realm_authentication_failed]\trealm=[{}]; {}; principal=[{}]; uri=[{}]{}"; localNodeInfo.prefix;
                        realm; hostAttributes(request); token.principal(); request.uri(); opaqueId());


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