I am running a server on a Raspberry Pi which is connected to a FritzBox. From within the network, I can reach the server both via the local IP and via the registered URL. From the outside, it is however not working.
the 'HTTP and HTTPS server' items have TCP protocol, the other ones are with UDP. However, when checking my ports here, the port seems to be closed:
The apache server on the raspberry pi is configured to allow at least everything on Port 80, as the file
/etc/apache2/sites-enabled/000-default.conf has a block
<VirtualHost *:80> ... <VirtualHost>.
Rather than getting the ultimate solution, I'd like to gather ideas on what ELSE could potentially block requests from the outside? Is there a way to identify whether the request reaches the router, but not the raspberry, to narrow down the problem?