When you are using Apache for development, it still accepts connections from everyone in the same network as you.

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In order to only allow requests to your Apache coming from your local computer, edit your /etc/apache2/ports.conf so all Listen directives point to 127.0.0.1:

Listen 127.0.0.1:80
<IfModule mod_ssl.c>
    Listen 127.0.0.1:443
</IfModule>

After the change stop and start your Apache and check with netstat that Apache no longer listens to 0.0.0.0:

sudo /etc/init.d/apache2 stop
sudo /etc/init.d/apache2 start
sudo netstat -napl | grep apache