paessler prtg invers 

PRTG functions as a
free syslog server


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    Free syslog server for Windows

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    Capture and analyze syslog messages
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    Alerts in the event of syslog error messages and incidents


Free Download

Unlimited use of PRTG for 30 days. After 30 days PRTG reverts to the freeware edition.
You can upgrade to a paid license at any time.






Setting up a free syslog server with PRTG

Syslog is a standard for sending log messages within a network. It is supported by a variety of devices.
The syslog protocol provides a wide range of system info, thus syslog monitoring is an important part of network monitoring.


 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.)

Option 1

Option 1

As network monitoring software, PRTG lets you capture and monitor syslog messages. To do so, simply create a centralized Syslog Receiver Sensor in PRTG. This sensor captures and analyzes the contents of all the messages that are sent to PRTG. If an error occurs or your threshold values are exceeded, you’ll be notified at once. PRTG thus acts as your syslog server.

Option 2

Option 2

Another possibility: first add each sender as a device, then install a Syslog Receiver Sensor in each of these new devices. With this option, you’ll put a lot less strain on your CPU. On the other hand, you’ll need more sensors for it to work. That means your 100 free sensors may not be enough for in-depth monitoring.


Video tutorial: Setting up a syslog server


Free Download

Unlimited use of PRTG for 30 days. After 30 days PRTG reverts to the freeware edition.
You can upgrade to a paid license at any time.



Syslog server: PRTG captures and processes the following data

syslog messages

Upon receiving syslog messages, PRTG displays all relevant information with regard to the message, including the IP address from which the message was sent, the time of the message, and the message itself.

severity level

PRTG also analyzes the severity level to check for potential emergencies. This level ranges from “0” (emergency) to “7” (debug). PRTG even reads and processes the facility code. As a result, you can immediately identify the type of message that was sent.


 iSyslog stands for System Logging Protocol and is a standard protocol used to send system log or event messages to a specific server, called a syslog server. It is primarily used to collect various device logs from several different machines in a central location for monitoring and review. The protocol is enabled on most network equipment such as routers, switches, firewalls, and even some printers and scanners. In addition, syslog is available on Unix and Linux based systems and many web servers including Apache.
Read more


A sneak peek at PRTG as a syslog server


Is PRTG the right tool for you? It depends...

Scenario 1

Scenario 1: You'd like to, but...

Many sysadmins would like to use a professional network monitoring tool but don’t have the budget to do so. Getting higher-ups to free up the necessary funds can be both time-consuming and stressful. Often it’s a whole lot easier just to use a free tool. PRTG makes this possible. It comes with 100 free sensors that never expire.

Scenario 2

Scenario 2: Sometimes a small tool does the trick

Other sysadmins are in charge of relatively small networks. For them, PRTG might be a bit too much. Nevertheless, these sysadmins may discover that the free version, which can function as a Windows syslog server while offering sensors to spare, is the perfect solution.

Scenario 3

Scenario 3: The home network

Ever sit at home in front of your computer and wonder how to set up a syslog server for your home network? You’re not alone. Many sysadmins also want reliable software for their homes. PRTG can be used as a syslog server for any network.


Your options: Free server monitoring or a license?

Server monitoring freeware

Server monitoring freeware

You’re welcome to try the full version of PRTG for 30 days for free. After the first month, you can continue to use 100 sensors for as long as you like. For each of your devices, you’ll need around 10 sensors. The 100 free sensors are yours to choose however you please. These sensors often suffice for setting up basic server monitoring. If you have a small network, then the free version may be all you ever need. What’s more, the alarm and reports features are included.

Our licenses

Our licenses

PRTG offers a variety of different licenses. Each of these licenses gives you access to a specific number of sensors. If you need more sensors, you can simply upgrade your license. Any existing monitoring will remain unchanged. Many sysadmins start out with the free trial version. This lets you get a feel for the monitoring tool with no strings attached.


Free Download

Unlimited use of PRTG for 30 days. After 30 days PRTG reverts to the freeware edition.
You can upgrade to a paid license at any time.



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.

vendors vm ware


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



Got a few sensors left to spare? Set up some lightweight yet effective network monitoring

Network availability

Network availability

With the PRTG Ping Sensor, you can monitor the availability of all the hardware in your network. Servers, routers, switches, workstations…PRTG keeps an eye on everything. More on uptime monitoring with PRTG

Network bandwidth

Network bandwidth

How much traffic passes through your network? When and where do spikes in traffic occur? How does your traffic change over time? PRTG tells you all this and more. As a result, you can take all the necessary precautions to ensure your network is running at optimal capacity. More on bandwidth monitoring with PRTG.


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 use of PRTG for 30 days. After 30 days PRTG reverts to the freeware edition.
You can upgrade to a paid license at any time.



Your new syslog server is up and running, but you want more? Convince your CTO with the following three reports.

Downtime report

Downtime report

Is your network more up or down?  This report is an absolute must, for whenever your network is down, productivity and sales suffer. More on uptime monitoring

Ports report

Ports report

PRTG monitors both open and closed ports. Port monitoring plays a vital role in ensuring malware (such as Trojans) does not infiltrate your network. Without monitoring software, it’s next to impossible to keep an eye on all your open ports.

Top 10 Talkers report

Top 10 Talkers report

What’s going on with the traffic in your network? In particular, which departments are generating the most? To find out, simply pull up the PRTG Top 10 Talkers report. PRTG provides real-time updates on the goings-on of your network – and promptly notifies you in the event of sudden and drastic changes.


Study: PRTG is not just a syslog server, but some truly valuable software



Paessler teams up with many partners

Partnering with innovative IT vendors, Paessler unleashes synergies to create
new and additional benefits for joined customers.


IP Fabric

Combining the broad monitoring feature set of PRTG with IP Fabric’s automated network assurance creates a new level of network visibility and reliability.

Read more


Rhebo and PRTG offer a comprehensive monitoring solution for IT and OT environments: from condition monitoring through to anomaly and threat detection.

Read more


UVexplorer integrates tightly with PRTG to bring fast and accurate network discovery, detailed device inventory, and automatic network mapping to the PRTG platform.

Read more


ping test

You want to know your ping time?

Then try our FREE ping test and we show you how to fix high ping times e.g. of your website by reducing number of HTTP requests, adding Expires or Cache-Control Header, and utilizing a CDN to reduce latency.

We’ll give you your ping time from 5 locations and help you to improve it.


By the way: PRTG is compatible with all the major manufacturers

  • Monitor Cisco devices: PRTG comes equipped with preconfigured sensors for Cisco devices. Use the Cisco IP SLA Sensor for VoIP applications, and the NetFlow and IPFIX sensors to monitor traffic. PRTG also captures the syslog files of Cisco devices. More on Cisco monitoring with PRTG
  • Monitor HP devices: Do you use HP servers, switches, or printers? PRTG reliably monitors all your HP hardware by way of SNMP sensors (among others). More on HP monitoring with PRTG
  • Monitor virtual environments: Hyper-V, VMware, Citrix...with PRTG, you get all the sensors you need to monitor your virtual environments. Above all, be sure to keep a close eye on your virtual servers.

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


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



Network Monitoring Software - Version (June 22nd, 2022)


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

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