/**
     * Collects NTLM parameters from all NTLM authentication configurations.
     *
     * @return merged Properties if NTLM auth is found, null otherwise
     */
    protected Properties collectNtlmParameters() {
        if (initParamMap == null) {
            return null;
        }
        final Object value = initParamMap.get(AUTHENTICATIONS_PROPERTY);
        if (value == null) {
            return null;