"Check the firewall"

The above three words are probably the first ones that we, firewall guys, hear during a network outage, or maybe whenever an application doesn't work.

Let's face it: most of the times, the firewall (or the security appliance) is the first suspect during an outage. And that's because the firewall is mainly seen as a networking gear that blocks traffic, rather than a device that provides connectivity.

For that reason we, firewall guys, not only have to continually prove others our device innocence, but in the process of doing so, we also often find out the real culprit: layer 8, router, switch, cable, application... you name it!. Of course, the firewall is sometimes the root cause. After all, we are talking about a complex device that operates on all network layers to protect our network from increasingly sophisticated attacks and misuse. 

My name is Paul, and I have been working with firewalls for more than a decade. I decided to create this blog to share with you what I believe it's useful information for firewall administrators. Initially, most of the content will be Fortinet-related, because that's the vendor I have the most experience with. However, in the future, I plan to incorporate information from other big cybersecurity players as well.

I hope you find the information on this blog helpful. Feel free to reach out if you have any suggestions to improve the site, and please take a moment to read our disclaimer.


Paul Marin

Paul Marin
A Network Security Engineer based in Canada.