The game was updated today, so they probably need to tweak accordingly to make the server playable. If they're running an older version of Unturned, you won't be able to play on it.
The issue has been fixed. Basically, PvE8 had a 30 GB "Barricades" file and caused it to use 30 GB of memory on the server and ultimately caused the other servers to crash because we were "out of memory". Stopped: PvE8 Deleted: Barricades File from PvE8 Started: Servers that crashed. - Issue Resolved. Not sure what caused the 30 GB file, however some kind of exploit or something going around possibly.