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How to "Deny" a device in DHCP on SonicWall TZ 500

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Last Modified: 2017-08-25
I had this question after viewing Sonicwall - View all DHCP clients connected.

I have a sonic wall tz500 and am wondering why I cannot "deny" a connection from a device that I keep seeing on DHCP. How can I do this? Why woudn't a firewall have that ability?
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None of this is working. At all. Is is getting to be an issue. I have address objects and rules and firewall rules in place to DENY yet these devices (all wireless) are still accessing the network. What is the deal and why is this sonic wall such crap? It shoudknt' be that hard to get a FIREWALL to deny network access by mac address. So frustrating.
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