Buffalo Technology LT-H90 - Manual (Page 17)

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The Options tab will let you turn on and off file sharing. It also
includes other options, including the ability to control whether the
media server starts when your computer starts.
To disable file sharing, press the Turn OFF File Sharing button.
You may want to turn on Access Control to prevent certain
devices from accessing your media content. This is especially
important if there are multiple LinkTheaters or other DLNA
playback devices on your network.
If you’d like to prevent some devices from accessing your date
while permitting others, press the Turn ON Access Control
button. Press Add to bring up the access control wizard.