Server connects but displays no media files

[ebr 16676]

Okay, that confirms my thesis I'm pretty sure.  You probably also cloned one server from the other, right?  So they both had the same server ID and looked like the same server to the apps.

2 hours ago, twofacetoo said:

I've just checked again that the laptop IS connected to the internet safely, and it is.

That's not really relevant for what you are trying to do.  You are trying to connect within your network.

2 hours ago, twofacetoo said:

I tried doing it manually with the IP address listed on the laptop's server

Which one?  The LAN or WAN?  You should be using the LAN one.  If that doesn't work, then that brings us back to firewall settings on your laptop.  Look at the firewall rules on your PC and make sure the same ones are on your laptop.