Cannot access KA-Lite via http://localhost:8008/ in all situations

[richsegal]

If you boot RACHEL 64EN 4.0 on a Pi 2 without an ethernet cable or wifi dongle attached, you will find that you cannot access KA-Lite using http://localhost:8008/. The address http://127.0.0.1:8008/ works fine. There appears to be a networking configuration issue as simply running:

sudo systemctl restart networking

fixes the problem. I have temporarily fixed the issue in my own images by adding the above command (without sudo) to /etc/rc.local. However, this is a hack and does not address the underlying cause so I do not recommend it for an official distribution. Unfortunately, I do not understand the root cause of the problem yet, so I do not have a proper fix.

Note, the problem goes away if your Pi connects to a network at any time since it was powered up. I have not tested the Pi 3, but it may behave differently due the presence of the builtin Wi-Fi support.