for future reference, in-case this ever happens again (which in my experience has happened about every other month) You can just switch your server into offline mode, in the server.props, just set online=false, and your users will be able to connect. If you are worried about people logging in with name changers, then just dont tell anyone you did it, (just let them think the problem isnt happening anymore) also, the technicpack dosnt support name changers (i tried) so someone would have to build a custom client just to connect as someone else :P