Hey!
I got this warning in my admin section that it seems that my data directory is not properly secured. So i added the following lines to the .htaccess
<IfModule !mod_authz_core.c>
Order deny,allow
Deny from all
</IfModule>
<IfModule mod_authz_core.c>
Require all denied
</IfModule>
but after this my wiki is not accessable at all. it promts me with a server issue.