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My modem/router, a Cisco EPC3925, has something called "Wi-Fi Protected Setup" or "WPS", preventing me from changing certain settings. This includes turning wireless off altogether.
This feature hands over control of said settings to my ISP. Thus, if I want to turn of wireless, I need to contact them.
I'd like to turn off this "WPS", so I regain control. There is a checkbox on the web interface for "manual" control, but it is disabled.
In addition to this, make sure "Wireless Network" is enabled, or you won't be able to change the setting. – Protector one – 2013-03-18T20:03:08.413