Bonjour et merci de prendre le temps de me répondre.
J'ai retiré ce que j'avais mis dans httpd.conf.
Mon nagios.conf contient ceci :
ScriptAlias /nagios/cgi-bin/ /usr/lib/nagios/cgi-bin/
<Directory /usr/lib/nagios/cgi-bin/>
Options ExecCGI
order deny,allow
allow from all
allow from 127.0.0.1
AuthType Basic
AuthUserFile /etc/nagios/passwd
AuthName "nagios"
require valid-user
</Directory>
Alias /nagios/ /usr/share/nagios/html/
<Directory /usr/share/nagios/html/>
Options None
order deny,allow
allow from all
allow from 127.0.0.1
AuthType Basic
AuthUserFile /etc/nagios/passwd
AuthName "nagios"
require valid-user
</Directory>