I didn’t realize this a few days ago when I was unable to access PMangar. I though it was the server’s problem but I managed to login to the control panel. To find out the reason (with an assumption already in mind), I googled co.cc and as expected, saw another post talking about co.cc subdomains disappearing.
OK, so that’s all about the topic and let’s just hope that dot.tk is never going to be in the same situation.