All systems are operational.
Service provider still needs to fix someone, thus some further downtime. Shouldn't take long.
There is an issue DNS resolve, seemingly caused by a problem on service provider's side. Trying to get it fixed.
Update: they have now resolved the issue with unintended DNS/53 filtering.
Running updates today, soon, that will require server reboots.
Done!
Doing some maintenance so some of the sub-sites might not be accessible at all times.
Investigating an issue with networking, affecting all sites.
Update: Service provider has fixed the issue.