🚨 Set Up Monit Custom Email Alerts in OPNsense 🚨
Want to receive real-time email notifications for critical events in OPNsense?
📡 Follow this guide to configure Monit email alerts using Gmail SMTP:
🔗 Step-by-step setup here:
Once you’ve set up Monit email alerts, let’s take it a step further!
Here is the video version of this written tutorial:
📌 Custom Alert: Portal_Failed_Login_Attempt
This alert will notify you via email whenever a failed login attempt occurs on your OPNsense web interface.
🔹 Step 1: Enable Monit in OPNsense
If you haven’t set up Monit yet, follow the guide above to enable it.
🔹 Step 2: Create a Custom Service Test
1️⃣ Navigate to Services > Monit > Service Tests Settings
2️⃣ Click + Add to create a new test
3️⃣ Set the following values:
- Name:
Portal Failed Login
- Condition: content = “authentication error”
- Action: Alert
4️⃣ Click Save and apply changes

🔹 Step 3: Monitor the Audit Log for Failed Logins
1️⃣ Go to Services > Monit > Service Settings
2️⃣ Click + Add to create a new monitored service
3️⃣ Set the following:
- Name:
web_portal_failed_login
- Type:
File
- Path:
/var/log/audit/latest.log
- Tests: Select
(the test created in Step 2)Portal Failed Login
4️⃣ Click Save and apply

🔹 Step 4: Configure Alerts
1️⃣ Go to Services > Monit > Alert Settings
2️⃣ Click + Add to create an alert
3️⃣ Set the following:
- Recipient email: Your email
- Events: Select Content failed
- Message Format:
reply-to: noreply@sysadmin102.com
Subject: 🚨 Failed Login Attempt Detected! 🚨
Message: Failed Login Attempt Detected!
📅 Date: $DATE
🌐 Source IP: $DESCRIPTION
4️⃣ Click Save and apply
🔹 Step 5: Test Your Alert
1️⃣ Attempt a failed login to your OPNsense web portal
2️⃣ Check your email inbox for the alert! 📩
💡 Why Enable This Alert?
🔹 Detect brute force login attempts in real-time
🔹 Improve security monitoring for your firewall
🔹 Stay informed about unauthorized access attempts
✅ Set it up today and secure your OPNsense environment!
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