Clicking on single player game, open to LAN then trying to connect to the game from any other computer or os fails to connect.

*What I expected to happen was...: play multiplayer offline

I want to play multiplayer offline without internet.

What actually happened was...:
Failed to login: the authentication servers are currently down for maintenance.

Steps to Reproduce:
1. Each player logged in
2) disconnect from internet.
3) start minecraft
4) start single player game
5) open to labln
6)use any other computer or is to connect multi player game.
7) server is visible, but connection always fails with authentication server error.