Execution of ldap runnable failed – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch fails to execute a task related to LDAP (Lightweight Directory Access Protocol), which is often used for user authentication. This could be due to incorrect LDAP configuration, network issues, or problems with the LDAP server itself. To resolve this issue, you can check the LDAP configuration in Elasticsearch for any errors, ensure the network connection to the LDAP server is stable, and verify that the LDAP server is functioning correctly. If the problem persists, you may need to check the Elasticsearch logs for more detailed error information.

This guide will help you check for common problems that cause the log ” execution of ldap runnable failed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “execution of ldap runnable failed” classname is LdapRealm.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            this.logger = logger;

        public void onFailure(Exception e) {
            logger.error("execution of ldap runnable failed"; e);
            final T result = defaultValue.apply(e);



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