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How To Setup OpenVPN Server In 5 Minutes on Ubuntu Server

I am a new Ubuntu Linux server user. How do I setup an OpenVPN Server on Ubuntu Linux version 14.04 or 16.04 LTS server to shield my browsing activity from bad guys on public Wi-Fi, and more?
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How to block an IP address with ufw on Ubuntu Linux server

I am using UFW to manage firewall on my Ubuntu Linux 12.04/14.04 LTS server. I need to block a specific IP address from accessing my server. How do I block an IP address using ufw?
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Ubuntu: Stat / Stop / Restart Iptables Firewall Service

I am a new Ubuntu Linux version 12.04 LTS user. How do I stop or start iptables based firewall service on Ubuntu Linux using bash command line options?
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