What map is the character that y'er trying to log in as in? The official FH maps are up from what I can see, so if ye are in one of those, then it may be on y'er side that is causing the issue.
If y'er in a downloaded map, then it could be that the map lost server connection. If that is the case, ye will need to wait 'till there is a server refresh. The server refreshes every once in a while, so it should take 'bout a couple days or under.