Local Insurgency Game not Showing

[Valmont]

Hello Guys.

Most weekends I host a 10 computers LAN at my house.

Whenever I host LOCAL coop matches other players can the see and join the match just fine.

When I choose INSURGENCY game mode instead of COOP when creating a LOCAL (Listen) server players cannot see nor join the game.

Any Idea how can I make Insurgency work on my LAN?

PS: No internet on the LAN.

Thanks!