How to check whether the IP Address of the user is passively added to the Blacklist of the Firewall?

In CLI mode, run the display firewall blacklist item command to view the blacklist of the firewall, and check whether the IP address of the user is on the blacklist. If the IP address of the user is on the blacklist, the firewall directly discards all packets of this user. If the corresponding blacklist entry exists, run the undo firewall blacklist item command to delete the blacklist entry.

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