Get your company implementing DMARC now… During the past 5-6 years email industry efforts have been pushing the DMARC standard along. It provides the best widely supported and seemingly efficient way to - as a domain-owner - protect the domain from misuse and abuse in terms of spam and phishing attacks. As sending email has often been a wild-west, and knowing who is a valid sender of email may prove a challenge for many companies - and as most IT developers does seem to care too much about the finer details of email (and production just as bad email headers as HTML markup :-) ), implementing DMARC protection on your domain may actually be a challenge.
So, I’ve been moving the site to a VPS - a Virtual Private Server. A VPS is basically the same as a physical server to which you can’t have physical access. When you get your virtual server, most likely it will be setup with a basic disk image with an Operating System and a root account. In my case at DigitalOcean I choose to setup an Ubuntu Linux image and here are the first moves you should take after creating the VPS to get the basic security in place.
A firewall is a basic filter that can provide an efficient protection to your server by only allowing the traffic in and out as the rules of the firewall allows it. Setting up a firewall on a Ubuntu Linux server does not need to be complicated - in fact the one used in this example is called “uncomplicated firewall”. To get the firewall up and running make sure it’s installed through the package manager.
While surfing the net, you often come across web agencies how promote SSL-certificates (or TLS security) on their products - or their ability to create “secure web applications” with SSL. Most users know HTTPS/SSL/TLS as the little lock, that promises “security” when visiting a page - but what kind of security it actually provides is rarely explained - and far worse often misunderstood. The while SSL is the popular name (and as it was once known) and HTTPS usually is the way users sees it (as part of a URL in a browser) - the correct name is TLS a short for Transport Layer Security.
I’m still enjoying the fresh new Ubunutu 9.04, and one of the nice new features is a firewall – which Canonical calls “Uncomplicated Firewall”. I’m usually not hooked on firewalls, but just for the fun of it I enabled the firewall on my laptop and it seems to work quite well. The firewall doesn’t seem to have any noticeable impact on system performance and as the laptop from time to time visits open wifi’s, it’s probably a good idea to have protection from other users on open networks.