Miscellaneous: IP blocked

[Yubba]

Hello I am sure that it has been brought up before but I didn't see a fix while trolling the forums. I am currently getting the error "You are currently not allowed to log in to the server because this IP has a temp block on it". I have someone else over and it seems to be that only one of us can be logged in at the same time. Is there a way to fix this besides changing my IP? No one close has wireless internet or I would do that.
Thanks in advance.