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He wrote more than 7k+ posts and helped numerous readers to master IT topics. Vivek Gite is the founder of nixCraft, the oldest running blog about Linux and open source. Ubuntu 22.04 LTS Set Up UFW Firewall in 5 Minutes.

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Open ssh port 22 using ufw on Ubuntu/Debian Linux.Install UFW firewall on Ubuntu 16.04 LTS server.This entry is 9 of 12 in the Uncomplicated Firewall (UFW) series. Make sure you read ufw man page here and see our other pages below. This page demonstrated various ways to list and remove/erase UFW firewall rules using the command line options. We pass bash shell variable $ip to awk script using the -v and then matched inside awk using regex. Let us start with -dry-run option and make sure you run command as root user: We are going to use the awk command to find and replace “ufw” with “ufw delete” Linux command. Ufw allow from 192.168.184.8 to any port 443 proto tcp Ufw allow from 192.168.184.8 to any port 80 proto tcp Ufw allow from 192.168.184.8 to any port 3307 proto tcp Ufw allow from 192.168.184.8 to any port 22 proto tcp Ufw allow from 192.168.184.8 to any port 3306 proto tcp Here is how to list all such rules using the UFW and grep command: Say you want use the “delete” command for deleting the ufw rule for all source IP address starting with 192.168.184.8. This may disrupt existing sshĬonnections. Resetting all rules to installed defaults.

Debian firewall