ufw command HowTo - Linux / Unix Q & A from nixCraft

Linux disable firewall command

last updated April 16, 2019 in Iptables, Linux, Networking, Security

I am a new Linux system administrator. I have a hardware-based firewall, so I don’t need a firewall on each server. How do I disable the firewall on Linux?

Ubuntu 18.04 LTS Set Up OpenVPN Server In 5 Minutes

last updated September 27, 2018 in Linux, OpenVPN, Ubuntu Linux

I am a new Ubuntu Linux 18.04 LTS server user. How do I set up an OpenVPN Server on Ubuntu Linux version 18.04 LTS server to shield my browsing activity from bad guys on public Wi-Fi, and more?

How to open DNS port 53 using ufw on Ubuntu/Debian Linux

last updated June 11, 2018 in Debian / Ubuntu, Iptables, Security

How do I allow incoming DNS tcp/udp port 53 connections from a specific IP address or subnet on a Ubuntu or Debian Linux server using ufw? How can I open DNS port 53 using ufw firewall?

Install and Configure an OpenVPN on Debian 9 In 5 Minutes

last updated March 8, 2019 in Debian / Ubuntu, Linux, Networking, OpenVPN, Security

I am a new Debian Linux version 9 server user. How do I setup an OpenVPN Server on Debian Linux version 9.x or 8.x server to shield my browsing activity from bad guys on public Wi-Fi, and more?

How to open ssh port using ufw on Ubuntu/Debian Linux

last updated August 18, 2017 in Debian / Ubuntu, Iptables, Linux, Ubuntu Linux

How do I allow incoming SSH connections from a specific IP address or subnet on a Ubuntu or Debian Linux server using ufw?

How to configure ufw to forward port 80/443 to internal server hosted on LAN

last updated August 18, 2017 in Debian / Ubuntu, Iptables, Linux, Ubuntu Linux

I am using UFW to protect my network. How do I forward TCP HTTP port # 80 and 443 to an internal server hosted at 192.168.1.100:80 and 192.168.1.100:443 using UFW on Ubuntu Linux server?

How to limit SSH (TCP port 22) connections with ufw on Ubuntu Linux

last updated August 18, 2017 in Debian / Ubuntu, Iptables, Linux, Ubuntu Linux

How do I limit ssh connection attempts using UFW (Uncomplicated Firewall) on Ubuntu or Debian Linux server?