When playing Diablo 2 multiplayer do both players have to forward their ports for direct IP?

Yes, when playing Diablo 2 in multiplayer mode using direct IP connection, both players need to forward their ports. This is necessary to allow incoming connections through their routers, ensuring that both players can connect to each other’s game. Typically, port 4000 is used for Diablo 2, so players should ensure this port is forwarded to their local IP addresses. Without proper port forwarding on both ends, players may experience connection issues.