if( getUncPath0().length() == 1 || dest.getUncPath0().length() == 1 ) {
            throw new SmbException( "Invalid operation for workgroups, servers, or shares" );
        }

        resolveDfs(null);
        dest.resolveDfs(null);

        if (!tree.equals(dest.tree)) {
            throw new SmbException( "Invalid operation for workgroups, servers, or shares" );
        }

        if( log.level >= 3 )

            links.map.put("\\", dr);
            DfsReferralDataInternal tmp = dr;
            do {
                /*
                 * Store references to the map and key so that
                 * SmbFile.resolveDfs can re-insert the dr list with
                 * the dr that was successful so that subsequent
                 * attempts to resolve DFS use the last successful
                 * referral first.
                 */