ZyXEL Communications NWD210N User Manual page 46

Chapter 3 Wireless LANs
You can easily check to see if this has happened. WPS works between only two devices
simultaneously, so if another device has enrolled your device will be unable to enroll, and
will not have access to the network. If this happens, open the access point's configuration
interface and look at the list of associated clients (usually displayed by MAC address). It
does not matter if the access point is the WPS registrar, the enrollee, or was not involved
in the WPS handshake; a rogue device must still associate with the access point to gain
access to the network. Check the MAC addresses of your wireless clients (usually printed
on a label on the bottom of the device). If there is an unknown MAC address you can
remove it or reset the AP.
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NWD210N User's Guide