Network, Systems and Security Administration
I nearly told a colleague that packets weren’t reaching our FortiGate. I had what looked like good evidence: the diagnose debug flow filters were configured correctly, the test connection was…
An open network port isn’t automatically a security problem. That’s an important distinction that often gets lost when people talk about port scanning. A server might legitimately have TCP 443…
Port security looks simple when you first come across it. Limit the number of MAC addresses on a switch port, decide what happens when something unexpected appears, and you are…
Intermittent packet loss can waste an enormous amount of time. The network works, then it doesn’t. A Teams call turns choppy, an RDP session freezes for a few seconds, an…
Cisco Expressway gives organisations running Cisco Unified Communications Manager a way to extend collaboration services to users outside the corporate network. For Mobile and Remote Access (MRA), the deployment normally…
A remote user once had a SonicWall Global VPN Client (GVC) connection that worked from one network but failed from another. The GVC log kept reporting: The peer is not…