PRTG Network Monitor is widely used by IT administrators to monitor servers, network devices, and services.
However, a common problem arises when the PRTG server itself goes down due to an internet outage or network failure.
In this situation, internal monitoring becomes ineffective because alerts cannot be sent.
This is where external monitoring using UptimeRobot becomes essential.

In this guide, you will learn how to monitor PRTG server downtime using UptimeRobot, even when your company loses internet connectivity.
This setup ensures that your monitoring system is always being monitored.

Why Monitoring PRTG from Outside Is Important

PRTG is usually deployed inside the internal network.
When the internet connection fails, PRTG may still be running, but it becomes unreachable from the outside.
As a result, administrators may not receive any alerts.

By using an external monitoring service like UptimeRobot, you gain visibility from outside your network.
This allows you to detect outages, server failures, and internet issues immediately.
External monitoring acts as a safety net for your monitoring infrastructure.

What Is UptimeRobot?

UptimeRobot is a cloud-based uptime monitoring service.
It regularly checks the availability of a server or website from multiple global locations.
When a service becomes unreachable, UptimeRobot sends alerts via email, SMS, or other notification channels.

Because UptimeRobot operates outside your local network, it is ideal for monitoring critical services such as PRTG.

Monitoring PRTG Server Downtime with UptimeRobot

In this setup, UptimeRobot monitors the public access point of the PRTG server.
If your PRTG server or internet connection goes down, UptimeRobot will immediately detect the failure.
You will receive an alert even though PRTG itself cannot send notifications.

This approach is especially useful for:

• Internet outages

• Firewall or ISP issues

• Power failures affecting network connectivity

• Complete PRTG server downtime

Benefits of External Monitoring for PRTG

Using UptimeRobot to monitor PRTG provides several advantages:

• Guaranteed alerts during internet outages

• Improved reliability of monitoring

• Faster incident response

• Better visibility into real-world availability

For businesses and IT administrators, this extra layer of monitoring is critical for maintaining uptime and service quality.

Use Case: Internet Outage Scenario

Imagine your company loses its internet connection overnight.
PRTG continues running internally, but no alerts are sent because external communication is unavailable.
Without external monitoring, the issue may go unnoticed for hours.

With UptimeRobot in place, you are instantly notified when PRTG becomes unreachable.
This allows you to take action immediately and minimize downtime.

Conclusion

Monitoring the monitoring system itself is a best practice in modern IT environments.
By using UptimeRobot to monitor PRTG server downtime, you ensure continuous visibility even during internet outages.
This setup adds resilience, reliability, and peace of mind to your monitoring strategy.
Follow this guide to build a robust external monitoring solution for your PRTG server.

Free Plan:
• 50 Monitors
• Check every 5 minutes
• Email + App Push
Recommendation: Because it’s a free plan, it has quite limited features (the number of hosts and the scan time is 5 minutes), so UptimeRobot Free is only suitable for checking if the company’s internet is down or up (if the company’s internet is down and PRTG is located on that site, it cannot send alerts).

Step 1: Register an account

Registration link: https://uptimerobot.com/

Step 2: Create an uptime monitor

Monitor Type: HTTPS

📌 Benefits:

• Distinguishes:

o Web service down

Set maximum 5 minutes, less than 5 minutes incurs a fee.

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Monitor Type: Ping
📌 Benefits:

• Distinguishes:

o Server/Internet down

Firewall must allow ping