Joncy
You can still download releases and create jails from the FreeNAS command-line by specifying use a FreeBSD mirror. For example
# iocage fetch -s ftp5.fr.FreeBSD.org -d mirrors/ftp.freebsd.org/releases/amd64 -r 11.2-RELEASE
Adrian wrote a great tutorial about using iocage to create a LimeSurvey jail.
INTRODUCTION Before we begin, I'm really no expert when it comes to this stuff, so most of what I've 'learnt' to put together this guide has come from other threads on this forum (e.g. here) and from Google searches. If you attempt this and it doesn't work, I may not be able to help you...
www.ixsystems.com
Then whenever this network issue is resolved, the jails will appear and may be managed using the GUI.
HTH - Andy
PS. I am following this thread with interest as I am also in London (VirginMedia ISP) and the site is accessible for me today.