It looks like our hosting company is having problems with the network connectivity with our server. They tell us that
After detecting that there is a problem with the network connectivity to some of our servers we have run extensive verifications and checks to establish the nature and the severity of the issue. It turned out that there is an unexpected network failure in our data center that affected your host server.
Network failures like this are rare but unfortunately totally unpredictable. However, we would like to assure you that our server administrators have all the needed expertise and follow strict procedures to minimize the negative effect of such an event.
We are now working together with the technicians from our data center on fixing the network problem as quickly as possible. For now, it seems there is a major problem somewhere along the route to some providers around the world, however we will keep you updated on the progress of our work.
We'll keep donors up to date on this blog with info as we know it.