apache2 + munin configuration

[rudu <rudu@cegetel.net>]

Hi,
Well, I wouldn't have thought having so many difficulties setting up a 
simple monitoring system on my Jessie amd64 desktop, but after a few 
hours wandering the net, I guess I could use some guidance ...

What I've done so far :
aptitude install apache2 munin munin-node
ii  apache2                      2.4.6-3 amd64               Apache HTTP 
Server
ii  munin                        2.0.17-3 all                 
network-wide graphing framework (grapher/gatherer)
ii  munin-node                   2.0.17-3 all                 
network-wide graphing framework (node)

Then I tried to connect to http://localhost/munin only to get :
Forbidden
You don't have permission to access /munin on this server.
Apache/2.4.6 (Debian) Server at localhost Port 80

I found some threads here and there via google which lead me to try 
several things.
First in /etc/munin/apache.conf :
replace

<Directory /var/cache/munin/www>
        Order allow,deny
        Allow from localhost 127.0.0.0/8 ::1

        Options None
[...]
</Directory>

by

<Directory /var/cache/munin/www>
        Order allow,deny
        Allow from all

        Options None
[...]
</Directory>

Then I did :
chown -R www-data:munin /var/cache/munin/www
chmod -R 775 /var/cache/munin/www

I even added my user to the munin group
But I still get this error 403 from apache.

FWIW I got this in /var/log/apache2/error.log :
[Tue Nov 12 17:53:03.987560 2013] [authz_core:error] [pid 2758:tid 
139900372383488] [client ::1:53049] AH01630: client denied by server 
configuration: /var/cache/munin/www

Thanks for any help.
Rudu