}
            else {
                try ( SmbSessionInternal ssn = trans.getSmbSession(tf.withDefaultCredentials()).unwrap(SmbSessionInternal.class) ) {
                    ssn.treeConnectLogon();
                }
            }
            return new NtlmChallenge(trans.getServerEncryptionKey(), dc);
        }
        catch ( SmbException e ) {
            throw e;
        }