J’ai retrouvé ce log d’error dans apache2, peut-être que ça peut aider :
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pi@raspberrypi ~ $ sudo tail /var/log/apache2/error.log
[Tue May 27 22:09:05 2014] [error] [client 127.0.0.1] File does not exist: /var/www/favicon.ico
[Tue May 27 22:09:09 2014] [error] [client 127.0.0.1] File does not exist: /home/wims/public_html/gifs/themes/default/icon.css, referer: http://127.0.0.1/wims/wims.cgi?session=JI56ED8521.5&+lang=fr&+module=adm%2Fclass%2Fclasses&+type=participant&+keyword=
[Tue May 27 22:09:10 2014] [error] [client 127.0.0.1] File does not exist: /var/www/favicon.ico
[Tue May 27 22:09:10 2014] [error] [client 127.0.0.1] File does not exist: /var/www/favicon.ico
[Tue May 27 22:09:12 2014] [error] [client 127.0.0.1] File does not exist: /home/wims/public_html/gifs/themes/default/icon.css, referer: http://127.0.0.1/wims/wims.cgi?session=JI56ED8521.6&+lang=fr&+module=adm%2Fclass%2Fclasses&+type=authparticipant&+class=9472233&+subclass=yes
[Tue May 27 22:09:13 2014] [error] [client 127.0.0.1] File does not exist: /var/www/favicon.ico
[Tue May 27 22:09:13 2014] [error] [client 127.0.0.1] File does not exist: /var/www/favicon.ico
[Tue May 27 22:09:22 2014] [error] [client 127.0.0.1] Premature end of script headers: wims.cgi, referer: http://127.0.0.1/wims/wims.cgi?session=JI56ED8521.6&+lang=fr&+module=adm%2Fclass%2Fclasses&+type=authparticipant&+class=9472233&+subclass=yes
[Tue May 27 22:09:23 2014] [error] [client 127.0.0.1] File does not exist: /var/www/favicon.ico
[Tue May 27 22:09:23 2014] [error] [client 127.0.0.1] File does not exist: /var/www/favicon.ico
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Mickaël