How to Block IP Address in UFW Firewall on Ubuntu

Опубликовано: 20 Октябрь 2025
на канале: RealClearComputing
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Learn how to block IP addresses in the UFW firewall on Ubuntu. In this video, I’ll show you the correct way to use the ufw deny command and explain why rule order is important for blocking to work properly.

You'll also see how to insert deny rules in the right position using ufw insert, and how to fix cases where a deny rule is ignored because of existing allow rules.

Topics Covered:
UFW deny command syntax
Blocking IP addresses on specific ports
Rule order in UFW firewall
Using ufw insert to make blocking effective
Live demo from Ubuntu server

Links:
Commands and Examples: https://www.configserverfirewall.com/...

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Timestamps
00:00 – Introduction
00:20 – UFW deny command syntax
00:27 – Importance of rule order in UFW
01:26 – How to block IP addresses
02:40 – Using ufw insert to make the block effective

#ubuntu #ufw #firewall #netwroking