Authentication to realm failed – – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your Elasticsearch operation.

Briefly, this error occurs when Elasticsearch cannot authenticate a user due to incorrect credentials or misconfigured authentication settings in the Elasticsearch realm. To resolve this issue, you can: 1) Verify the user credentials are correct and try again. 2) Check the authentication settings in the Elasticsearch realm and ensure they are correctly configured. 3) If using an external authentication service, ensure it is properly connected and functioning. 4) Check the Elasticsearch logs for more detailed error information.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” Authentication to realm {} 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 to realm {} failed – {}{}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        ActionListener> listener
    ) {
        messages.forEach((realm; tuple) -> {
            final String message = tuple.v1();
            final String cause = tuple.v2() == null ? "" : " (Caused by " + tuple.v2() + ")";
            logger.warn("Authentication to realm {} failed - {}{}";; message; cause);
        if (context.getUnlicensedRealms().isEmpty() == false) {
                "Authentication failed using realms [{}]."
                    + " Realms [{}] were skipped because they are not permitted on the current license";


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Get expert answers on Elasticsearch/OpenSearch