if (this.loadBalance) {
                    NtlmChallenge chal = (NtlmChallenge) ssn.getAttribute("NtlmHttpChal");
                    if (chal == null) {
                        chal = getChallengeForDomain(this.defaultDomain);
                        ssn.setAttribute("NtlmHttpChal", chal);
                    }
                    dc = chal.dc;
                    challenge = chal.challenge;
                } else {

                if (loadBalance) {
                    NtlmChallenge chal = (NtlmChallenge) ssn.getAttribute("NtlmHttpChal");
                    if (chal == null) {
                        chal = SmbSession.getChallengeForDomain();
                        ssn.setAttribute("NtlmHttpChal", chal);
                    }
                    dc = chal.dc;
                    challenge = chal.challenge;
                } else {

     * @throws SmbException if an SMB error occurs
     * @throws UnknownHostException if the domain controller cannot be resolved
     */
    public static NtlmChallenge getChallengeForDomain() throws SmbException, UnknownHostException {
        if (DOMAIN == null) {
            throw new SmbException("A domain was not specified");
        }
        synchronized (DOMAIN) {