Unknown error when adding console ctrl handler – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while trying to add a console control handler, which is a mechanism used to manage and control console processes. This could be due to a variety of reasons such as incorrect configuration, insufficient permissions, or a bug in the software. To resolve this issue, you could try updating Elasticsearch to the latest version, checking the configuration settings, or ensuring that the user running Elasticsearch has the necessary permissions. If the problem persists, consider seeking help from the Elasticsearch community or support.

This guide will help you check for common problems that cause the log ” unknown error {} when adding console ctrl handler ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: bootstrap, handler.

Log Context

Log “unknown error {} when adding console ctrl handler” classname is JNANatives.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            try {
                boolean result = JNAKernel32Library.getInstance().addConsoleCtrlHandler(handler);
                if (result) {
                    logger.debug("console ctrl handler correctly set");
                } else {
                    logger.warn("unknown error {} when adding console ctrl handler"; Native.getLastError());
            } catch (UnsatisfiedLinkError e) {
                // this will have already been logged by Kernel32Library; no need to repeat it


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