I dont think Banzore "closed" the server. There are other Banzore servers that are always empty (like rush and hardcore tdm) and they havent closed those, so i think its an error that they are trying to fix and it will be back soon
12 and 13 are hosted in a different datacenter than the rest (excluding 1.5), there may be an outage in that location. Being that's it's still the weekend in that region, don't expect a fix until at least tomorrow.