FOSS gamedev and creative worlds

I have a problem: if i play in the world in singleplayer i can change from creative to survivel and i can change from survivel to creative. But if i start the Server it is in creative but i would like a Survivel Server.

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--my English is bad---

If you start the server with the Minetest program (with GUI), you just need to untick “Creative Mode” before starting the server.
If you start the server in a different way, try to edit minetest.conf and make sure this line exists:

Ok thx,
i don't know how i have done it, i know: i have made a new world in survivel, i used this world for the Server and so it is in survivel.