.unwrap(SmbSessionInternal.class);
                      SmbTreeImpl tr = s.getSmbTree(share, null).unwrap(SmbTreeImpl.class) ) {
                    if ( referral != null ) {
                        tr.markDomainDfs();
                    }
                    tr.treeConnect(null, null);
                    return tr.acquire();
                }
            }
            else {
                throw sae;