Unable to get mac address will use a dummy address – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is unable to retrieve the MAC address of the host machine, which is used for node identification. This could be due to security restrictions or an unsupported operating system. To resolve this issue, you can either adjust your security settings to allow Elasticsearch to access the MAC address, or manually set a unique node identifier in the Elasticsearch configuration file. Alternatively, you can ignore this error if it doesn’t affect your use case, as Elasticsearch will use a dummy address instead.

This guide will help you check for common problems that cause the log ” Unable to get mac address; will use a dummy address ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: Index and Memory.

Log Context

Log “Unable to get mac address; will use a dummy address” classname is MacAddressProvider.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

     public static byte[] getSecureMungedAddress() {
        byte[] address = null;
        try {
            address = getMacAddress();
        } catch (Throwable t) {
            logger.warn("Unable to get mac address; will use a dummy address"; t);
            // address will be set below

        if (!isValidAddress(address)) {
            logger.warn("Unable to get a valid mac address; will use a dummy address");


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