There's an easy way to reset an OSX 10.8 and 10.9 server back to initial settings.
1. Drag the server app to the trash, the system will detect this and then warn you that it is stopping all services.
2. Rename /Library/Server to /Library/Server.old
3. Reboot the machine ( maybe not necessary, but might be needed to clear any stuck processes )
4. Move the Server app back into Applications
5. Launch it. It will start afresh.