Operations | Monitoring | ITSM | DevOps | Cloud

A firewall running low on memory rarely fails all at once. It degrades first. Connections drop intermittently, policies take longer to process, and by the time the device becomes unresponsive, the problem has been building for days or weeks. This article walks through what firewall memory usage actually means, what causes it to climb, how to spot the symptoms early, and how to troubleshoot and fix it before it takes your network down with it.

We've been making a series of improvements across Obkio’s Network Monitoring and Observability application, and a lot of that work has been focused on one goal: simplifying not just how we show network performance data, but how easy it is to actually interpret and understand that data. Not everyone monitoring a network has the time, or the networking background, to dig through graphs line by line to figure out what's going on.

A full outage is the easy version of this job. Something goes down, someone notices immediately, you fix it, and you move on. Everyone understands that problem, including the users complaining about it. Intermittent network connectivity issues are a different animal. Your network connection works, then it doesn't, then it does again, all on its own, usually before you've had a chance to open a single tool. By the time you sit down to look, the network is behaving perfectly.

The Internet at one of your school sites slows to a crawl. Teachers can't load their lesson plans. A video call for a virtual class freezes. Your IT team calls the ISP. The ISP runs its own checks and tells you everything looks fine on their end. Sound familiar? This is the core problem every school board and public institution runs into eventually. Your ISP has full visibility into their own network. You don't.

Most network teams only find out their firewall is overloaded after users start complaining. A slow VPN, dropped calls, and random packet loss at 2 pm every day. The usual suspects get blamed first: the ISP, the switch, the application server. The firewall gets a pass because the dashboard says 40% CPU and everything looks fine. Here is the problem with that picture. Standard SNMP monitoring polls every 5 minutes. A CPU spike that peaks at 95% and recovers within 90 seconds never shows up.

Obkio is proud to announce an important investment from Devolutions, one of the most respected names in IT security and remote access management. This investment marks a new chapter for Obkio as we accelerate our next phase of growth. This isn't a financial transaction between strangers. It's a partnership between two companies that have spent years building tools for the same people: IT professionals, sysadmins, MSPs, and the network engineers who keep critical network infrastructure running.

Most network teams monitor uptime. A lot of them track CPU. Almost none of them consistently monitor memory utilization on routers, firewalls, and switches, and that gap causes more unexplained outages and intermittent issues than most people realize.

Your VoIP calls are choppy. File uploads are crawling. Your team is complaining that the CRM is sluggish, and remote desktop sessions keep freezing. You check your firewall, your switches look clean, and there are no alerts on your LAN. The problem isn't inside your network. It's upstream, and it's happening quietly every day during peak hours.

Here is a reality that every network admin eventually runs into: users report slow apps, dropped calls, and broken connections, and the first instinct is to blame the ISP or the cloud provider. The ticket gets escalated, the ISP pushes back, and hours later, you find out the problem was sitting inside your own building the whole time. A saturated switch port. A misconfigured VLAN. A flaky patch cable in the server room.

Most IT teams rely on Microsoft Teams Admin Center as their default monitoring tool to find and fix Microsoft Teams issues, but there's a gap between what it shows and what actually causes call quality problems. Teams Admin Center gives you Microsoft's perspective on what happened after an MS Teams call ended. It doesn't tell you what was happening on your network, on your users' devices, or in the five minutes before the complaints started coming in.