The server status shows in the top lefthand corner of the forum screen, you can check it before logging on to make sure the game is online. The status is also posted to FeralHearts dA page.
Is it the whole game derping, or a specific map? If it's a specific map (like Flourite) you're trying to get into, it may take a few tries. Because of the recent server changes, fewer people can get in at a time. It may also be your internet connection, if you have slower internet.