I am trying to set up a Forge server, and have gotten rather far. However, when I'm in the server I can't place any of the blocks from the mods, mobs from the mods do not spawn, and commands from the mods do not work. Any blocks I place in immediately disappear, and cannot be thrown. Everything runs smoothly in single player. If I started a vanilla server, please state how to fix it if possible with the information I gave. Mods used to load in the server, and stopped after I did something, I don't know what. The command prompt doesn't seen to load the mods.