Log Authentication of elastic was terminated by realm reserved – How To Solve Related Issues

Log Authentication of elastic was terminated by realm reserved – How To Solve Related Issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up  which can resolve issues causing many log errors (free and no installation required)


This guide will help you check for common problems that cause the log “Authentication of [elastic] was terminated by realm [reserved]” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: plugin.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations. 

Log Context

Log”Authentication of [{}] was terminated by realm [{}] – {}” classname is AuthenticationService.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                            } else {
                                // the user was not authenticated; call this so we can audit the correct event
                                request.realmAuthenticationFailed(authenticationToken; realm.name());
                                if (result.getStatus() == AuthenticationResult.Status.TERMINATE) {
                                    logger.info("Authentication of [{}] was terminated by realm [{}] - {}";
                                            authenticationToken.principal(); realm.name(); result.getMessage());
                                    Exception e = (result.getException() != null) ? result.getException()
                                            : Exceptions.authenticationError(result.getMessage());
                                } else {


Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Authentication Of Elastic Was Termi  

Upgrade From 6 2 To 6 4 Gives Authe  


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