Render Node network license

I don't think I really understood the manual, and I'm encountering issues implementing network license for render nodes.

First, is this even possible with an activation key? Would I need a hardware/dongle license?

Right now I have an activation key and I'm running Fusion 17 on a workstation. I have other computers on another subnet that I could use as render nodes. I'm running CentOS 7 on those computers. So I created /etc/profile.d/fusion.sh so that

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# cat /etc/profile.d/fusion.sh
FUSION_LICENSE_SERVER=192.168.1.3


Now have an environment variable so that

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# echo $FUSION_LICENSE_SERVER
192.168.1.3


and

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# systemctl status fusion-server.service
● fusion-server.service - Blackmagic Fusion Service
   Loaded: loaded (/usr/lib/systemd/system/fusion-server.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat 2022-05-07 22:37:21 PDT; 14h ago
 Main PID: 1105 (FusionServer)
    Tasks: 8
   CGroup: /system.slice/fusion-server.service
           ├─1105 /opt/BlackmagicDesign/FusionRenderNode17/FusionServer -S
           └─1222 fuscript -s

May 07 22:37:21 hostname systemd[1]: Started Blackmagic Fusion Service.


But in the render slave GUI monitor widget it says not licensed. Does anyone know what I did wrong?

TheBloke seems to say in this post bellow that you should be able to use render nodes with an activation key.
viewtopic.php?f=21&t=146603

It would probably work automatically if the machines were on the same subnet.

I never personally tried the FUSION_LICENSE_SERVER environment variable, I cannot comment on it.
This post may help you in this regard. viewtopic.php?f=22&t=121706

Probably obvious, but also make sure to check that those 2 subnets can communicate between each other

If the computers are on different subnets there may be a router in the path between them - is it possible that the router might be blocking ports that they are attempting to communicate on?

If the render nodes are looking for a license server they are likely trying to connect back to the computer with your license key on it (or the one specified in that variable) so depending on how the router is configured you might need to make some kind of adjustment there?