There are many misleading posts about the game being down. Some are posting the link to this announcement which was posted yesterday and is not about today's issues.

Currently, the login/auth servers are down. The servers are experiencing difficulties. No official announcement about it yet. You are not banned, your account still works, you just can't log in. You may receive errors such as "wrong ID/Password". This is just because the servers can't be reached.

We must all wait for a fix / announcement.