Authentication using apikey failed – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

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

Briefly, this error occurs when authentication using an API key fails, which can cause issues with authorization in Elasticsearch. To resolve this issue, you can try to check the API key for errors, or generate a new API key.

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 ” Authentication using apikey failed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Authentication using apikey failed – {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                             : Exceptions.authenticationError(authResult.getMessage());
                    } else {
                        if (authResult.getMessage() != null) {
                            if (authResult.getException() != null) {
                                logger.warn(new ParameterizedMessage("Authentication using apikey failed - {}"; authResult.getMessage());
                            } else {
                                logger.warn("Authentication using apikey failed - {}"; authResult.getMessage());


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