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

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to add a console control handler due to an unknown error. This could be due to a variety of reasons such as incorrect configuration, insufficient permissions, or a software bug. To resolve this issue, you could try the following: 1) Check and correct the OpenSearch configuration settings, 2) Ensure the user running OpenSearch has the necessary permissions, 3) Update OpenSearch to the latest version to fix any potential bugs, and 4) If the error persists, consider seeking help from the OpenSearch community or support.

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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 OpenSearch concepts: handler, bootstrap.

Log Context

Log “unknown error {} when adding console ctrl handler” classname is JNANatives.java.
We extracted the following from OpenSearch 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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