Cant resolve url to Index Controller - php

Question

I've created a simple Zend Framework 1.12 test app via the zf.bat on my windows machine (xampp, php5.3): "zf create project testapp"
After that i've created an new controller called 'FoobarController' next to the 'IndexController'.
Now I can switch between these urls:
localhost/projects/testapp/public/
localhost/projects/testapp/public/index
localhost/projects/testapp/public/foobar
Now I have uploaded the whole testapp into the web server directory of my raspberry pi (192.168.1.100, Apache2, PHP5.3, ModRewite On, AllowOverride All).
This urls are working fine when I call the raspberry from the windows machine:
192.168.1.100/sites/testapp/public
192.168.1.100/sites/testapp/public/foobar
This one will display: "The requested URL /sites/testapp/public/index was not found on this server"
192.168.1.100/sites/testapp/public/index
Has someone an idea why the url to the "index" controller wont work properly on my raspberry? (I did nothing more than the explained steps)
/etc/apache2/sites-available/default:
<VirtualHost *:80>
ServerAdmin webmaster#localhost
DocumentRoot "/var/www/html"
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>
<Directory "/var/www/html">
Options Indexes FollowSymLinks MultiViews
AllowOverride All
Order allow,deny
allow from all
</Directory>
ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
<Directory "/usr/lib/cgi-bin">
AllowOverride None
Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
Order allow,deny
Allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>
.htaccess:
RewriteEngine On
RewriteBase /sites/testapp/public
# The following rule tells Apache that if the requested filename
# exists, simply serve it.
RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [NC,L]
# The following rewrites all other queries to index.php. The
# condition ensures that if you are using Apache aliases to do
# mass virtual hosting, the base path will be prepended to
# allow proper resolution of the index.php file; it will work
# in non-aliased environments as well, providing a safe, one-size
# fits all solution.
RewriteCond %{REQUEST_URI}::$1 ^(/.+)(.+)::$
RewriteRule ^(.*)$ - [E=BASE:%1]
RewriteRule ^(.*)$ %{ENV:BASE}index.php [NC,L]