Each FINAL FANTASY XIV: A Realm Reborn World server has been designed to support a maximum of 5,000 concurrent connections. This is not the maximum number of characters which can be created on a World, however, but the maximum number of characters which can be logged into that World simultaneously. When more than 5,000 characters log into a World at once, there is a higher risk of server crashes and login errors. The restoration of crashed servers is usually followed by a rush of players attempting to log back in, which, in turn, puts a strain on our lobby server, and can ultimately have an adverse affect on all of the Worlds.
To prevent this from happening, we felt that the safest course of action would be to limit logins. However, we would like you to know that the restrictions are under constant surveillance. We are currently monitoring login numbers on all Worlds 24 hours a day, and actively removing/applying restrictions as soon as we detect even the smallest fluctuation in concurrent connection numbers.