Minecraft:How to regenerate default server.properties
From Serenity Servers Support
If you accidentally removed the file, you can generate a new one with the default settings by following these simple steps.
- Enter the gamepanel, and enter the game services afterwards. You should now be able to stop the server, which you need to do if you have not already done so.
- Click the configuration files tab, and locate the server.properties file. Usually its at the very top of the page.
- Press the Configuration Editor and edit the variables to fit your needs, like the server motd, pvp, whitelist etc.
- Save the file and restart your server, it should now be starting as normal.