PRTG is a Windows-based network monitoring tool by Paessler with HTTP sensors for uptime monitoring. This guide covers how to set up comprehensive uptime monitoring for services running on or integrated with PRTG Network Monitor.
Why Monitor PRTG Services Externally?
Built-in monitoring tools from PRTG are designed to monitor their own platform's health. But your users don't care about internal metrics. They care about whether your service is accessible, fast, and working correctly. External uptime monitoring tests your service the way a real user would: from outside your infrastructure.
This outside-in perspective catches problems that internal monitoring misses: DNS issues, CDN failures, SSL certificate problems, and even platform-wide outages where the monitoring tool itself might be affected.
PRTG's Built-in Monitoring
PRTG includes HTTP, HTTPS, and port sensors for uptime monitoring. Supports SNMP, WMI, flow, and packet sniffing for network monitoring. Desktop and web interfaces with auto-discovery.
These capabilities are useful for understanding platform-level health, but they don't provide a complete picture of your service's availability from a user perspective.
Limitations for Uptime Monitoring
Windows-only server. Pricing based on sensor count, which limits how many endpoints you monitor. Single-location monitoring unless you deploy remote probes. Cloud-based external checks are limited.
Setting Up External Monitoring with Warden
Warden provides cloud-native, multi-region uptime monitoring that complements PRTG's network-focused monitoring. No Windows server required. Unlimited monitors without sensor-based pricing.
To get started:
- Identify your critical endpoints — Your homepage, API health check, authentication endpoint, and key user-facing pages
- Set check frequency — Match your SLA target. For 99.9% uptime, check every 1-2 minutes. For 99.99%, check every 10-30 seconds
- Enable SSL monitoring — Check your certificates and set expiry alerts for 30 days in advance
- Configure smart alerting — Use confirmation thresholds and flap detection to reduce false positives. Upgrade to Warden Cloud for multi-zone checks across regions
- Set up alerting — Send alerts to Slack for awareness and PagerDuty for on-call escalation
- Create a status page — Give your users visibility into service health
Best Practices
- Layer your monitoring — Use PRTG's built-in tools for internal metrics and Warden for external availability checks
- Monitor the full stack — Don't just check if the server responds. Verify the response contains expected content (keyword checks)
- Track your error budget — Use the error budget calculator to understand how much downtime you can afford and how fast you're consuming it
- Quantify downtime cost — Use the downtime cost calculator to build the business case for monitoring investment
- Test your alerts — Regularly verify that alerts reach the right people through the right channels
- Review and iterate — Check your monitoring setup monthly. Add new endpoints as your service grows. Tune alert thresholds to reduce noise
PRTG Monitoring FAQ
Does PRTG have built-in uptime monitoring?
PRTG includes HTTP, HTTPS, and port sensors for uptime monitoring. Supports SNMP, WMI, flow, and packet sniffing for network monitoring. Desktop and web interfaces with auto-discovery.
What are the limitations of PRTG for uptime monitoring?
Windows-only server. Pricing based on sensor count, which limits how many endpoints you monitor. Single-location monitoring unless you deploy remote probes. Cloud-based external checks are limited.
Can I use Warden alongside PRTG?
Yes. Warden is designed to complement existing tools. Use PRTG for its core strengths and Warden for dedicated, high-frequency external uptime monitoring with SSL monitoring, status pages, and RBAC. The managed cloud plan adds multi-zone checks from multiple regions.
How often should I monitor services hosted on PRTG?
For production services with SLA commitments, check every 10-30 seconds. For staging/development, 1-5 minute intervals are usually sufficient. Use our uptime calculator to determine the right interval for your SLA target.
Join the Warden waitlist to get started with high-frequency uptime monitoring for your PRTG services. Self-host for free or upgrade to managed cloud with multi-zone monitoring.