Crashes out of the multiplayer session

After we go into a local multiplayer session with a friend and one of us spawns the transport the multiplayer does not work and we are no longer on the same server. In the server console writes that he has left the game

let him check the firewall , and same to you , since it’s local i suppose it’s running at ur PC and you both at same network, so there high chance it’s Firewall/antivirus Problem. if not same network , then make sure your firewall and his are set to private and to double check that ports are working , i had problem before where my router was the problem but it’s very low chance if it’s local.