Network fault management with PRTG:
Identify errors, improve performance


  • PRTG monitors hardware

  • PRTG monitors applications

  • PRTG monitors network traffic

  • PRTG sounds the alarm in the event of errors, malfunctions, and crashes


Free Download

Unlimited version of PRTG for 30 days. After 30 days, PRTG reverts to a free version.
Or, you can upgrade to a paid license anytime.





Sensors for eliminating network errors in a jiffy


 i What is a sensor?

In PRTG, “sensors” are the basic monitoring elements. One sensor usually monitors one measured value in your network, e.g. the traffic of a switch port, the CPU load of a server, the free space of a disk drive. On average you need about 5-10 sensors per device or one sensor per switch port.

View video (3:26 min.)

Errors in network devices

Errors in network devices

Initial ping monitoring is automatically set up during installation. Ping sensors display the status of each of your network devices. These devices include routers and switches which can sometimes cause bottlenecks. As a result, you may be able to detect the source of the error at once. More on ping monitoring.

Verifying server errors

Verifying server errors

Is an error or malfunction affecting your database servers, web servers, or mail servers? PRTG monitors your servers around the clock. In the event of a server crash or failure, you’ll be notified at once. More on server monitoring

Network connection errors

Network connection errors

Your connections keep going down – but you have no idea why? Our SNMP Sensor provides an immediate overview. Packet sniffing sensors perform in-depth analyses on your traffic. And with our QoS sensors, you can monitor your quality of service. More on packet sniffing.


A short summary of three important terms:
Network management, fault management, and network monitoring

Network management

“Network management” encompasses any task that an IT manager performs with regard to their IT infrastructure, and includes error, configuration, invoice, performance, and security management. There are open-source as well as proprietary tools for each of these tasks. The right tool depends, among other things, on the size of the network and the demands of the IT manager.

Fault management

The term “IT fault management” is used in a broader context. It involves identifying, diagnosing, and evaluating errors. These errors can include program errors, operating errors, or certain human errors. IT fault management is used to come up with measures for keeping errors to a minimum. Network monitoring plays an important role in this process.

Network monitoring

"Network monitoring” is a passive way of monitoring a network. Sensors automatically monitor the hardware, applications, and traffic in your network. If a malfunction or a critical error occurs, an alert is sent immediately so the IT manager can take action at once. A network monitoring tool like PRTG saves time, prevents crashes, and lets sysadmins focus on other important tasks.


Keep a constant eye on your network
– even while on the go

PRTG can be started within minutes and it's compatible with many mobile devices.


PRTG comes with all the features you need, plus more your IT infrastructure won't want to live without.


PRTG monitors these vendors and applications, and more, in one view!



Network fault management tool:
How PRTG can help


All error sources at a glance

All error sources at a glance

When using PRTG as a network fault management tool, you’ll get an overview of every possible source of errors. These sources include servers, computers, routers, and switches – even those from different manufacturers. If one of these devices malfunctions, an error usually occurs in the network. You can also use PRTG to monitor cloud applications, SAP, and other types of software. In addition, PRTG monitors your bandwidth and the traffic that flows through your network.


Alarm in the event of network errors

Alarm in the event of network errors

What happens when an error occurs in your network? With our software, you’ll automatically receive an alert. As a result, you can take action at once. No alert, no worries: if you haven’t received a notification, then you can be sure your system is running smoothly – and confidently go about the rest of your day.


Analyzing network errors

Analyzing network errors

Getting down to the root causes of network errors can sometimes be extremely time-consuming. PRTG helps you isolate problems faster – by letting you immediately exclude potential causes. A more thorough analysis – often done with additional tools – will help you explore the error in detail.


Long-term monitoring

Long-term monitoring

PRTG monitors your network around the clock. Long-term monitoring makes it easier to put a finger on the causes of recurring problems. Meanwhile, PRTG reports help you explain problems to your managers, who may have less IT expertise than yourself.


A customized approach to IT fault management

A customized approach to IT fault management

PRTG licenses are designed in accordance with the number of sensors you need, as well as your requirements with regard to network fault management. In general, you’ll need around 10 sensors for each of your devices. The first 100 sensors are free and never expire. And for the first 30 days, you get access to an unlimited number of sensors for your entire network infrastructure.


Trusted by 500,000 users
and recognized by industry analysts as a leader


“Fantastic network and infrastructure monitoring solution that is easy to deploy and easier still to use. Simply the best available.”

Read more reviews

“Software is absolutely perfect, Support is superior. Meets all needs and requirements, This is a must have solution if you are needing any form of monitoring.”

Read more reviews

“The tool excels at its primary focus of being a unified infrastructure management and network monitoring service.”

Read more reviews


Free Download

Unlimited version of PRTG for 30 days. After 30 days, PRTG reverts to a free version.
Or, you can upgrade to a paid license anytime.



Example: Eliminating network errors at conferences and trade shows




At conferences and trade shows, everything must run perfectly – including computers, monitors, and connections to the Web. Convention Center Dublin therefore relies on PRTG. “PRTG is intuitive and easy to use. Like all monitoring software, it must continually be adjusted. But once configured, it’s like no other. PRTG gives you a constant – and comprehensive – overview of your entire IT environment.” Craig Colley, IT Manager at Convention Center Dublin. To case study


Definition: Network fault vs. network error
Understanding the terms

Viele Begriffe

Many different terms

There are many different ways to say “network error.” Besides “error,” you might find “bug,” “fault,” or “failure.” It all depends on whether the term is being used by a system administrator, software developer, or software tester.

Network error

Countless errors occur in every network. Here are some examples of error codes for network problems: 400, 1106, 410, 503, 410, and 503. Depending on the severity of the error, the sysadmin may be required to take action at once. On the other hand, in the world of software development, an “error” occurs when a developer makes a mistake because of a misjudgment or misunderstanding.

Network faults

Sysadmins consider “faults” as general network errors that lead to a malfunction or crash. Fault network management was created to combat such errors. In software development, a “fault” is seen as an anomaly in code that leads to an error.


Over 95% of our customers recommend PRTG


Paessler AG worldwide trialled PRTG in over 600 IT departments.
The aim was to tune the network monitoring software closer to the needs of the administrators.
The result of the survey: over 95% of the participants would recommend PRTG - or already had.

Recommend PRTG


PRTG The Swiss Army knife

PRTG: The Swiss Army knife for sysadmins

Adapt PRTG individually and dynamically to your needs relying on a strong API:

  • HTTP API: Access monitoring data and manipulate monitoring objects using HTTP requests
  • Custom Sensors: Create your own sensors for customized monitoring
  • Custom Notifications: Create your own notifications to send alarms to external systems
  • REST Custom Sensor: Monitor almost everything that provides XML or JSON


Practical tip: “Hey Gerald, what would you tell sysadmins who are looking to monitor the traffic in their networks?“

“PRTG toplists give you a constant overview of the amount of bandwidth that is currently being used by IP addresses, devices, ports, services, and protocols. If these values change, you can take action at once.“

Gerald Schoch, technical editor at Paessler AG


PRTG simplifies your day

Our monitoring software works for you and promptly notifies you of potential issues.
It frees you to concentrate on your day-to-day tasks with peace of mind.


PRTG saves time

With PRTG, you get one central monitoring tool for your servers and entire network. Enjoy a quick overview of your whole infrastructure via our dashboard and app.

PRTG saves worry

Customizing PRTG is a breeze. Getting started or switching from another network monitoring tool is easy thanks to the auto-discovery and pre-configured device templates.

PRTG saves money

80% of our customers report substantial or even exceptional cost savings in the area of network monitoring. The experience shows that the costs for licenses have paid for themselves within a matter of weeks.






Still not convinced?



More than 500,000 sysadmins love PRTG

PRTG is used by companies of all sizes. Sysadmins love PRTG because it makes their job a whole lot easier.

Still not convinced?


Monitor your entire IT infrastructure

Bandwidth, servers, virtual environments, websites, VoIP services – PRTG keeps an eye on your entire network.




Free Download



Try PRTG for free

Everyone has different monitoring needs. That’s why we let you try PRTG for free. Start now with your 30-day trial.




Network Monitoring Software - Version (September 21st, 2021)


Download for Windows and cloud-based version PRTG Hosted Monitor available


English, German, Spanish, French, Portuguese, Dutch, Russian, Japanese, and Simplified Chinese


Up to 100 sensors for free (Price List)

Unified Monitoring

Network devices, bandwidth, servers, applications, virtual environments, remote systems, IoT, and more

Supported Vendors & Applications


This third party content uses Performance cookies. Change your Cookie Settings or

load anyways

*This will leave your Cookie Settings unchanged.