Can you add forge 1.12.2-14.23.5.2770? I want to start a server with mods, I put all the forges that you left and I wouldn't open the server at all. But in minecraft launcher everything was fine and I was able to enter the map in singleplayer ...
The Aternos forums are now deprecated
Learn more about this change here.
For help regarding Aternos, we recommend you to visit our support center.