*
     * @return witness server address or null if not found
     * @throws IOException if discovery fails
     */
    private InetAddress discoverWitnessService() throws IOException {
        // Try the same server first
        InetAddress serverAddress = transport.getRemoteAddress().toInetAddress();

        if (isWitnessServiceAvailable(serverAddress)) {
            return serverAddress;
        }

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