Hi ! for begin, thanks to everyone who will help me My problem is : When i click on "play online" in the celeste launcher, i have a error message : The game start but i can play in offline only I have a laptop and the game works very well with the same ethernet cable. I concluded that it comes from my fixed computer I tried all possible solutions so as not to disturb you. I tried : - Disable firewall - Change ipv4 - Reboot my pc - Reset my PC - Install the game with Steam - Install the game without steam - Try on new launcher - Reset and reboot my box - Change ethernet cable - Updates my pc - Copy game files from my laptop to my PC I specify that I am alone at home / I think it came from my network card so.. Long live the one who finds the problem thanks for reading Error : Failed to resolve local IP! Playing with players in the same LAN-network might not work.