You don’t have permission to access /galleries/ on this server.
Remove Apache version signature
On ServerTokens uncomment the line with ServerTokens Prod or add it.
Uncomment the ServerSignature Off entry or add it.
Remove PHP version from headers
I guess that by default they are disabled, but in any case you can remove it by editing the php.ini and set expose_php to off.
sudo nano /etc/php5/apache2/php.ini