start-server.bat - a Windows batch file which starts the server using the serverconfig.txt file.serverconfig.txt - the config file with all server parameters.TerrariaServer.exe - the main server file.I assume that you are using the Windows operation system: In the root folder, you will find some useful files. Next, go to the steamapps/common/Terraria: That is the primary Steam library folder. Go to Steam → Settings in the main menu Īll games are installed under d:\SteamLibrary\.The location depends on where your Steam library folder is. Find Terraria's root folderįirst, go to the Terraria's root folder. In that case open task manager and end all processes with Terraria name. If you will run the server first you may get an error Steam - Error: An error occurred while updating Terraria (app running). Just run it via Steam or shortcut, don't do anything further. For example c:\SteamLibrary\steamapps\common\Terraria\start-server-steam-friends.bat To play Terraria with friends using Steam you need to run and setup Terraria Server, which is a console app that is located at Terraria root folder.