When you load SOTT, you are actually loading it through CloudFlare - which has servers all over the world. Depending on where you are, you are loading the site through a different CloudFlare server than other people in different geographic areas.
So, today, there were no problems with the SOTT server itself, but it seems there were outages at CloudFlare.
Thus, it worked fine all day from one place, but from another place it appeared to be down.