so i enter the server, and it tells me to login and enter my password in this format : /username <password> is this a hack??? never seen this before
No, its not a hack. do /register <password> (u have to remember the password also) then /login <same thing you put for registering^>
This is a temporary security measure, Just register and make a password that you will remember, Look here for info on how to change you password: http://www.ecocitycraft.com/forum/viewtopic.php?f=8&p=109053#p109053