Networking works in some qubes, but not in others (fedora-40-xfce on R4.2)

Hi, new to Qubes, I’ve been experimenting with making all the types of Qubes, but I can get networking on only one of my Service qubes but not others, one of my Template qubes but not others, 3 of my Application qubes has it working but not 5 others, I have no idea why.
What settings do I need to check to make networking work?

Welcome to Qubes.

Networking should be automatic if you have the netvm set in a qube.

There’s almost never any need to have templates directly connected to
the network because they use a proxy to get updates. This is covered in
the docs.

So that is where you start. If you have sys-net connected to a network,
and you have a qube with netvm set to sys-net, it should be able to
access that network. Then, a qube with netvm set to sys-firewall should
be able to access…, and so on.

Without a great deal more information it’s difficult to know what
problem you have encountered.
Start off with basic template-based qubes with netvms leading up to
sys-net.
If any dont work, look at the template they are using.

Gather information on what works and what doesnt and fed it back in
detail.

I never presume to speak for the Qubes team.
When I comment in the Forum I speak for myself.