Update:
de.meet.coop has been migrated to the new 2.3 server and more powerful hardware. The issues with connectivity should be gone now!
ca.meet.coop is a bit more tricky to deal with and we are actively following several paths to get it done, and see which one will be the quickest.
de2.meet.coop is still up with open registration for those that suffer from this issue on the CA server and need a working instance.