Invalid username in users file skipping – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch encounters an invalid username in the users file during the authentication process. This could be due to a syntax error, a non-existent user, or incorrect formatting in the users file. To resolve this issue, you can: 1) Check the syntax and formatting of the users file for any errors. 2) Verify that the username exists and is correctly spelled. 3) Ensure that the users file is in the correct location and is accessible by Elasticsearch. 4) If the error persists, consider resetting the username or creating a new user.

This guide will help you check for common problems that cause the log ” invalid username [{}] in users file [{}]; skipping… ({}) ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “invalid username [{}] in users file [{}]; skipping… ({})” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            String username = line.substring(0; i);
            Validation.Error validationError = Users.validateUsername(username; allowReserved; settings);
            if (validationError != null) {
                logger.error("invalid username [{}] in users file [{}]; skipping... ({})"; username; path.toAbsolutePath();
            String hash = line.substring(i + 1);
            users.put(username; hash.toCharArray());


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?