Due to health-related problems, I was away throughout the month of May and the first three weeks of June. I could not attend to the server and it went offline due to a power outage at my residence.
I am sorry for the disruption of service and I do not foresee any major interruption in the future.
Annoyingly, the dynamic address provider has stolen the address from me while I was away. I have had to pick the new address, yfs1.sytes.net, for the time being. After a few months, the dynamic address provider will release the original address (probably giving up that I am not going to pay for their service) and I will be able to go back to that.