Connnection refused...? What?

So Here's something weird. I was playing on this server just fine yesterday. Me and some friends were just doing our thing. Today, I come in, and suddenly, I find I can't login to my server. it keeps saying Connection refused.

Now I've waited the queue. I've done the proper stuff I did the first time to get the server going. Can I please get support on this, seeing as there's almost never anyone on Live support? I realize they have lives, but uh... This is kinda a big deal. That something happened Overnight to prevent my being able to log in to my server.

I had not, actually. I had been using the default IP that was given, as that had worked before. I'll try that now.

EDIT: Please excuse me for causing a fuss. It's kinda awkward having to change it every time, being a dynamic IP, but at least I can continue working. I'll inform my friends who also use my server. Ty for that suggestion.