In CWIS go to Properties > Security > IP Filtering
If you knew how to do this and have accidentally locked yourself out of the device you would need to access it from an unblocked IP, of none exist, hook up a laptop via crossover cable and statically assign an IP outside of the range of the copier and the PC to each and access it that way. So the PC could be 100.100.100.100 / 255.255.255.0/100.100.100.101, then put the printer on 100.100.100.101 / 255.255.255.0 / 100.100.100.100
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