They enable Telnet or FTP. You might be able to toggle them using conditionals similar to the command to enable/disable screenshots but for my uses, only turning on WiFi when I want to use them and turning WiFi off afterwards works for me. I do not enable WiFi when outside my home so I'm not worried about someone connecting to my Kobos.
You could add options to kill telnetd or ftpd as separate NickelMenu commands which might be simpler.
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