How to set up UniFi alerts for disconnected devices, high CPU, or WAN failure

You don’t need to be staring at your UniFi dashboard 24/7 to keep things running smoothly. That’s what alerts are for. Whether a device drops offline, your gateway hits 90% CPU, or your WAN connection cuts out, UniFi can tell you—automatically.

In this post, we’ll go through how to set up smart alerts for critical events like device disconnections, system overloads, and internet issues. No more surprises when clients call saying, “the Wi-Fi is down.”

Let’s dive in !!

Why UniFi alerts matter

You’ve got the gear installed. Everything’s working. But things break. WAN links go down. Access points get unplugged. Devices overheat. And if you don’t know right away, your users (or clients) will.

That’s why setting up alerts is not optional. It’s basic monitoring, and it’s already built into your UniFi setup.

Once alerts are set up, UniFi can notify you via email or push notification whenever something important happens—so you can fix it before it becomes a problem.

Where alerts live in UniFi

You’ll find alert settings under:

UniFi Network > Settings > System > Notifications

From here, you can control what kinds of alerts you want to receive and how you want to receive them.

You’ll also find:

• The option to enable or disable different alert types
• Settings for email and mobile push notifications
• Notification preferences per admin

Step 1: Enable notifications globally

Start by turning on notifications:

1. Open UniFi Network
2. Go to Settings > System > Notifications
3. Toggle on Alerts
4. Set your delivery preferences: email, push, or both

Make sure your email is verified and your mobile app is signed in. Otherwise, you won’t get anything.

Step 2: Set up alerts for disconnected devices

This one’s probably the most useful, especially for APs, switches, and cameras that might go down.

How to enable it:

1. Under Notifications, scroll to Device Alerts
2. Turn on Device Disconnected
3. UniFi will now alert you when any managed device disconnects unexpectedly

It’s smart enough to wait a few seconds before pinging you, so you don’t get spammed by every brief outage.

Pro tip: You can filter alerts by device type (e.g., just APs or gateways) or even by site if you’re managing multiple locations.

Step 3: Get alerts for high CPU usage

High CPU alerts are your early warning that something is straining your gear—too many clients, overloaded DPI, or some random loopstorm.

Where to find it:

1. In the same Notifications section
2. Scroll to System Alerts
3. Toggle on High CPU Usage
4. Choose a threshold: 80%, 90%, etc.

Now you’ll get notified if your UDM, USG, or switch hits that CPU load for more than a few minutes.

Heads-up: Spikes are normal during reboots, updates, or speed tests. But constant high usage means something’s wrong.

Step 4: Set up WAN failure alerts

Your internet goes down, but you don’t find out until a client texts you. Not ideal. Let UniFi tell you instead.

How to enable:

1. Scroll to WAN Alerts
2. Turn on WAN Disconnected
3. If you’re using dual WAN, you can also enable WAN Failover Activated or Secondary WAN Disconnected

UniFi will ping you the moment the gateway detects WAN loss. If you’ve got redundancy set up, it’ll let you know when the backup kicks in too.

Step 5: Choose your delivery method

By default, UniFi supports:

• Email notifications (must have email set in your UI account)
• Push notifications (via UniFi mobile app)

Make sure your UI account is linked and notifications are allowed in your device settings.

For email:

1. Log into unifi.ui.com
2. Go to your Profile
3. Verify your email and enable notifications

For mobile push:

1. Install the UniFi Network App (iOS / Android)
2. Log in with your UI account
3. Allow push notifications when prompted

If you manage multiple networks or clients, you’ll see alert filters per site.

Step 6: Manage alert frequency

If you’re getting too many alerts (e.g., for devices that flap constantly), you can tune this.

1. Go to Settings > Notifications
2. Click Advanced
3. Adjust thresholds or disable certain categories (like low-signal clients, which can get noisy)

Bonus: Use webhooks for Slack or integrations

UniFi also supports webhooks, so you can send alerts to Slack, Teams, or other platforms.

You’ll need to use UniFi OS 3.0+ and have access to:

UniFi OS > System Settings > Webhooks

From there:

• Create a new webhook
• Paste in your Slack/Teams webhook URL
• Choose the alert types you want forwarded

Now your team gets notified in the channel you all use daily—way faster than waiting for email.

Real-world alert use cases

1. Disconnected AP in a remote office

A single access point in a branch office goes down. The client doesn’t notice immediately. But you get a push notification, jump into the UniFi dashboard, and see it’s just a loose cable. Easy win.

2. WAN outage at 3 AM

Your UniFi Controller sends an email at 3:04 AM saying WAN1 is down. At 3:06, it says failover activated. At 3:15, WAN1 is back. You didn’t even have to do anything—but now you have a timeline for the ISP ticket.

3. UDM-Pro under load

You get a warning that your UDM-Pro is running at 95% CPU. You dig into it and find someone downloaded 300 GB of Steam games over the VPN. You pause DPI, adjust bandwidth, and avoid a full crash.

Alert limitations to keep in mind

• No SMS support natively
• No custom sound or alert escalation
• No built-in support for webhook retries
• AP flaps can trigger spammy alerts if not tuned

Still, for most users, email and push are enough.

Best practices for UniFi alerts

• Set alerts by role: your team lead might want WAN and CPU, techs might want device flaps
• Regularly audit who receives alerts—no point sending emails to old admins
• Combine alerts with automatic backups, so you can restore fast if something fails
• Monitor alert patterns—frequent device drops might mean cabling issues or power problems

Final thoughts

Setting up UniFi alerts is one of those five-minute tasks that saves you hours down the line. Whether it's a failing WAN link, a disappearing AP, or a system that's cooking under load, alerts help you act fast—and sometimes prevent issues before users even notice.

We build all of this into our hosted UniFi environments by default. If you’re juggling client networks and tired of chasing after disconnected sites, we’ve got your back. UniHosted gives you reliable monitoring, backups, and smart alerting without any self-hosting hassle. Give us a look.