trying to play with a friend in the same house/on same router
 

im confused to why we can't play together, if my buddy is online, when i try to enter world it goes to "YOU HAVE BEEN DISCONNECTED"

If he logs out, I can log in. We're on the same wireless router but we double checked and have different IP's. But even then I don't understand, because I can have two clients running from the same account.