SD-1.net is back up. However, there may be intermittent problems tonight due to DNS issues. Here is the report from our host:

There is currently an issue with our DNS system which is why many IPS Hosting sites may be down at this time, we expect this issue to be resolved shortly and appreciate your patience.

SD-1.net is down. We are aware of the problem and have an emergency support ticket in with our host. We do not know the cause or nature of the problem yet.