String defUser = config.getDefaultUsername();
        String defPassword = config.getDefaultPassword();
        String defDomain = config.getDefaultDomain();
        if ( defUser != null ) {
            this.defaultCredentials = new NtlmPasswordAuthenticator(defDomain, defUser, defPassword);
        } else {
            this.defaultCredentials = new NtlmPasswordAuthenticator();
        }
    }