The Indefero hosting is down, the virtual machine hosting the core of the service has lost access to the net, but can be accessed from the host. I am investigating the situation and will report here. No data loss.
Update: At 9:25AM CET the service is up again. Our provider was doing maintenance work on the routers and had some issues. This is not the first time we have a short period of downtime like that, in January at 1AM CET we had a 10 min downtime because of the reboot of one of the core router. I will check if it is possible to get the warm standby server in another datacenter from the same provider with the ability to switch the ip from one to another across the datacenters to help mitigate such situation.