hi!

in dns.inc.php, function is_valid_hostname_fqdn()

    $hostname = preg_replace("/\.$/","",$hostname);

    if (strlen($hostname) > 255) {
        error(ERR_DNS_HN_TOO_LONG);
        return false;
    }

i think that the length check is wrong because 255 includes the trailing dot.

please see
http://en.wikipedia.org/wiki/Domain_name#Domain_name_syntax and
http://en.wikipedia.org/wiki/Domain_name#cite_note-3

thank you,
raoul