coucou tout le monde
étant dépassé dans le monde de la sécurité je viens vous demander votre avis :

voila hier j'ai regarder les log dans /var/log/apache2

et voila ce que j'obtien dans le fichier error.log

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[Sun Mar 04 16:59:37 2012] [error] [client 83.204.63.95] File does not exist: /var/www/top
[Sun Mar 04 18:34:16 2012] [error] [client 91.121.163.142] File does not exist: /var/www/w00tw00t.at.blackhats.romanian.anti-sec:)
[Sun Mar 04 18:34:16 2012] [error] [client 91.121.163.142] File does not exist: /var/www/phpMyAdmin
[Sun Mar 04 18:34:16 2012] [error] [client 91.121.163.142] File does not exist: /var/www/phpmyadmin
[Sun Mar 04 18:34:16 2012] [error] [client 91.121.163.142] File does not exist: /var/www/pma
[Sun Mar 04 18:34:16 2012] [error] [client 91.121.163.142] File does not exist: /var/www/myadmin
[Sun Mar 04 18:34:16 2012] [error] [client 91.121.163.142] File does not exist: /var/www/MyAdmin
[Sun Mar 04 20:26:38 2012] [error] [client 193.47.80.41] File does not exist: /var/www/robots.txt
[Sun Mar 04 20:26:38 2012] [error] [client 193.47.80.41] File does not exist: /var/www/dl
[Mon Mar 05 00:27:03 2012] [error] [client 65.52.110.199] File does not exist: /var/www/robots.txt
[Mon Mar 05 00:39:14 2012] [error] [client 66.249.67.244] File does not exist: /var/www/robots.txt
[Mon Mar 05 00:44:10 2012] [error] [client 64.246.178.34] File does not exist: /var/www/robots.txt
[Mon Mar 05 05:30:52 2012] [error] [client 213.186.127.9] File does not exist: /var/www/robots.txt
[Mon Mar 05 06:33:58 2012] [error] [client 66.249.67.199] File does not exist: /var/www/robots.txt
[Mon Mar 05 07:32:29 2012] [error] [client 65.52.110.18] File does not exist: /var/www/robots.txt
[Mon Mar 05 07:53:17 2012] [error] [client 119.63.196.74] File does not exist: /var/www/robots.txt
[Mon Mar 05 11:59:12 2012] [error] [client 66.249.67.210] File does not exist: /var/www/robots.txt
[Mon Mar 05 14:11:33 2012] [error] [client 123.125.71.78] File does not exist: /var/www/robots.txt
[Mon Mar 05 15:11:47 2012] [error] [client 184.107.80.4] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Mon Mar 05 15:42:52 2012] [error] [client 178.32.154.51] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Mon Mar 05 16:32:12 2012] [error] [client 176.31.53.135] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.test0:)
[Mon Mar 05 17:43:44 2012] [error] [client 66.249.67.134] File does not exist: /var/www/robots.txt
ce qui se connecte sur mon serveur web cherche une page robot.txt mais pourquoi avec plusieur IP differente il cherche la meme page ?

ensuite quelqun pourrai m'expliquer ce que c'est que ces lignes? merci d'avance
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[Mon Mar 05 15:11:47 2012] [error] [client 184.107.80.4] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Mon Mar 05 15:42:52 2012] [error] [client 178.32.154.51] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Mon Mar 05 16:32:12 2012] [error] [client 176.31.53.135] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.test0:)