FINALLY!!!

All Services up and running normally. User account requests are now being accepted.As if you really want an account...

For the 1 person that cares: What happened this time was that (in short) the nameservers at the host were mismatched. That, in turn caused a DNS problem, and then the site goes down hard. Thanks to "Stephanie" at the hosting firm, the issue was resolved and we can start using the site again.

Thank God, this mess is over.