I have some doubts that this is a VM (evaluation) to blame, unless they changed some algorithms specifically for external connectors. If this evaluation VM has all those limitations, so what is the point to call it evaluation?
The only IP list that worked for me was https://cinsarmy.com/list/ci-badguys.txt
It doesn't have any commented text in it, just a list of IPs.
Those lists that have failed (Server not reachable) have some commented text, like the following:
These all lists are working on my other firewall appliance.
I do not know what IP lists you have on your 'FGT 7.0.9 physical appliance'.
Can you confirm that you set up Internet based IP lists and if they have a commented texts in them?
This is just my guess.
For the test purpose, I have created IP lists on the local Apache web server which are copies of the Internet based lists.
Locally, lists with the comment '#' work but not with the Internet based ones.
With the ';' comments local lists do not work as well.
But I never had 'Server not reachable' for any of the local lists.