Firewall (Gufw) settings

[Yoru3]

Previously I've had no problem installing and using miniDLNA on my local network, when I was using an old 32 bit notebook machine, several LL versions ago.
However, I've now tried to make miniDLNA a server on my main 64bit LL 4.2 machine, and I'm having problems.
I installed it from Synaptics, and it appears to be running as a server.

Code:

sudo service --status-all

I've also got sqlite3 installed, and after the /etc/minidlna.conf configuration has done the usual

Code:

sudo service minidlna restart

Code:

sudo service minidlna force-reload

Which has created the database, where I told it to, although the log does list some warning. Which I might need to get back to.
However, my client/controller machine (notepad) cannot see the server, and only sees the renderers.
Finally I realised that this is probably due to the server firewall, which is now by default set to ON.
In order to allow miniDLNA to work, I believe I have to open the TCP port 8200, and the UDP port 1900.
Unfortunately there doesn't seem to be a tutorial on the firewall yet (hint)

So, can anyone help on exactly how to open those port up, and ideally only to the local network.
Many thanks in advance.