On Tue, 21 Jun 2005, Sorin Savastre wrote:
> Utilizatorii unui server administrat de mine au reclamat ca nu pot
> trimite mail catre un anumit server. Mesajul de eroare este urmatorul:
> timed out while receiving the initial SMTP greeting
E pentru ca anumiti disperati blocheaza in firewall cu DROP
pachetele spre 113/tcp. E o timpenie avind in vedere ca multe aplicatii
fac cereri colo (mail, servere irc, altele). Macar sa le blocheze cu
REJECT.
Fii anten:
14:24:33 blackblue (Mituc):~>time { echo -e helo bre\\nmail from:
[EMAIL PROTECTED] to:[EMAIL PROTECTED] | nc 84.234.98.82 25; }
220 joker.tds.ro ESMTP Sendmail 8.9.3/8.9.3; Tue, 21 Jun 2005 11:03:43 GMT
250 joker.tds.ro Hello [EMAIL PROTECTED] [213.157.176.7],
pleased to meet you
250 [EMAIL PROTECTED] Sender ok
250 [EMAIL PROTECTED] Recipient ok
221 joker.tds.ro closing connection
real 0m0.213s
user 0m0.003s
sys 0m0.004s
14:24:39 blackblue (Mituc):~>sudo iptables -I INPUT -p tcp -m tcp
--dport 113 -j DROP
14:25:04 blackblue (Mituc):~>time { echo -e helo bre\\nmail from:
[EMAIL PROTECTED] to:[EMAIL PROTECTED] | nc 84.234.98.82 25; }
220 joker.tds.ro ESMTP Sendmail 8.9.3/8.9.3; Tue, 21 Jun 2005 11:04:43 GMT
250 joker.tds.ro Hello blackblue.iasi.rdsnet.ro [213.157.176.7], pleased
to meet you
250 [EMAIL PROTECTED] Sender ok
250 [EMAIL PROTECTED] Recipient ok
221 joker.tds.ro closing connection
real 0m30.125s
user 0m0.002s
sys 0m0.003s
Rau ati venit in lumea lui security through stupidity. iptables
-t mangle -I PREROUTING -j DROP pentru toti cei [care].
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