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Me and some friends have bought Magicka on Steam and we would like to have a session in a LAN party, without direct internet connection. Is it possible with some tricks?

Update: I am able to see my friend game in LAN filter but every time I try to connect the game told me authentication failed.

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@Batophobia LAN filter works but we get always a problem of authentication – Drake Sep 9 '13 at 11:28
IS the network secure? – Young Guilo Sep 12 '13 at 14:38
Is your internet secure? – Young Guilo Sep 12 '13 at 14:56
@Drake Are you online when you try to play, or is the Internet connection removed? It sounds like there may be a central server that still needs to be contacted to validate your game even when just playing LAN. – SevenSidedDie Sep 12 '13 at 15:22

You should try to disable VAC, as it might be the cause of this.

You can find it in the Host game menu(It might not have been available before, but it is now)

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If you host a server, no port-forwarding required, then you find out your IPv4 adress by opening the windows command prompt (Windows XP: Start, All Programs, Accessories, Command Prompt) (Windows Vista/7 Start, Type in "cmd" and click on the result) and typing in 'ipconfig'. Somewhere in the list it will say IPv4 adress..............

Start the server and tell everyone in the network to connect to your IPv4 adress

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They have no trouble finding each other, so IP connections have already been made and instructions on how to connect will not help. – SevenSidedDie Sep 14 '13 at 17:30
@SevenSidedDie And what if that just comes from the game server? (Which also decided based on your shared IP that you are in the LAN) I have seen this method help for other games. – akaltar Apr 8 '15 at 18:16

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