I've been playing with 2 friends of mine for two weeks and we never had problems to connect, but me and my sister always face "Connection Failed" after seeing "Connecting..." for a long time when we try to play together. I thought it could've been only me having SMAPI but I deleted my game's folder and reinstalled it and the problem persists. The host always loads the savegame with enough cabins going in Co-op > Host. We have tried joining by: Clicking on Joining game on Steam chat Accepting the game invite on Steam chat Typing in the savegame invite code Clicking on each other's savegame in the Co-op main menu And also: Deleting our games' folders and reinstalling on both PCs Disabling Windows Security antivirus and Windows Defender firewall in both PCs Restarting Steam on both PCs Restarting my modem Port-forwarding my modem as instructed here: https://www.stardewvalley.net/multiplayer-troubleshooting-guide/ In the first 3 times, the problem was solved by restarting Steam, but in the fourth time nothing worked. The only things left to try I can think of are: port-forwarding and restarting her modem, and installing the game in a different laptop of hers. Any other fixes? It's sad because we were really enjoying to play this game together, and now it seems impossible.