Disabling HTTP Communication 
(MF249dw / MF246dn / MF237w)
HTTP is used for communications over the network, such as when you access the machine via the Remote UI. If you are using a USB connection or are otherwise not using HTTP, you can disable HTTP to block malicious third-party intrusions via the unused HTTP port.
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Disabling HTTP disables some of the network capabilities, such as the Remote UI, WSD printing, and printing with Google Cloud Print.
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1
Tap <Menu> in the <Home> Screen.
2
Tap <Network Settings>.
If a screen for entering a PIN is displayed, enter the PIN with the numeric keys and tap <Apply>. Setting the System Manager PIN
3
Select <TCP/IP Settings> 
<Use HTTP>.
<Use HTTP>.4
Tap <Off>.
<Off>Disables HTTP communication.
<On>Enables HTTP communication.