Links to skilledtests.com are broken
from some time ago skilledtests.com domain it's no longer alive and quitter pages contains links like http://federation.skilledtests.com/ and some others.
Specially in those to choose a node can be important to change it.
BTW I don't know if there is a replacement for that domain right now. Just this one but not updated: https://gnu.io/social/try/
Regards! Colegota @email@example.com