This article applies as of PRTG 20 I would like to know more about the clustering feature of PRTG. Can you give me an introduction and some basic information about clustering?  Cluster basics One very helpful feature of PRTG is the cluster. A...

As of PRTG 21.2.68, you can use Azure Active Directory (Azure AD) as single sign-on (SSO) provider in PRTG. For the integration to work seamlessly, follow the steps in this article. Steps to take: Step 1: Configure Azure AD Step 2: Configure ...

This article applies as of PRTG 20 I want to set up Microsoft Azure sensors. For these sensors to work, I have to define credentials for Microsoft Azure in my PRTG installation and create Azure custom roles with the required permissions. Where ...

This article applies to PRTG Network Monitor 9.1.1 or later In the PRTG web interface I can see this message: Overload Protection is Active Click for details What does it mean? Overload Protection The PRTG web server has a built-in mechani...

is it possible to capture only one subnet of netflow traffic? For instance: If a switch processes traffic of the subnet 10.1.x.x and 10.2.x.x, would it be possible to capture only traffic of 10.2.x.x ? If you wish to compare the traffic usa...

This article applies to PRTG Network Monitor 19 or later Error messages when using WMI (Windows) sensors with a hybrid approach Some WMI (Windows) sensors can use a hybrid approach to query values from your Windows machines. When this option ...

What do I have to take into account when planning a large installation of PRTG Network Monitor? This article applies as of PRTG 20 Planning large installations of PRTG Network Monitor The maximum number of sensors that you can monitor with one...

This article applies as of PRTG 20 With a few hundred sensors, PRTG usually does not show any speed and performance issues. But with thousands of sensors, you might experience excessive CPU load, a slow PRTG web interface, or sensors that are no...

I have just installed PRTG and there are aspects in the web interface that I'd like to modify. Can you assist me in modifying the web interface and other aspects of PRTG? This article applies to PRTG Network Monitor 17.4.35 or later Note...

I've created some templates for devices and auto discovery. Now I want to change some settings in these templates. Is it possible to edit templates that I have created or do I just have to make new ones from scratch? Modifying on device t...

This article applies as of PRTG 21 I want to include and exclude sensors from an existing device template. How can I do that? Include and exclude filters for device templates You can use filters to define which sensors are added if you apply...

This article applies as of PRTG 20 I would like to know more about the high security standards of PRTG. Is there a list of PRTG security features? PRTG Network Monitor security features We at Paessler take the responsibility for your network ...

In PRTG's System Administration, in the User Interface tab, there is a Performance Strategy switch (All Features vs. More Speed) in section Web Server. What does the More Speed option do? Which features are missing when enabled? This art...

This article applies as of PRTG 20 I would like to know the ports that PRTG requires for full access and functionality. Can you please provide a list with all (potentially) used ports? PRTG port usage PRTG requires that several ports on your...

This article applies to PRTG Network Monitor 17.4.35 or later I want to change the following aspects of a report: Header image Contents of header / footer Order of report elements Graph sizes How can I do this? Modify Report Templates ...

When generating very large reports, PRTG runs into a timeout. How can I increase the default timeout value for report generation? This article applies to PRTG Network Monitor 19 or later Change Report Timeout Value By default, PRTG allows the ...

This article applies to PRTG Network Monitor 19 or later What sounds can I play in case of an alarm (for example, if a sensor is "Down" or in a "Warning" status)? How can I change the default sound that I hear in my browser ...

I want to change the appearance of the PRTG web interface in order to fit better into my company's corporate design. How can I do this? This article applies to PRTG Network Monitor 19 or later Customizing and re-branding the PRTG web int...

This article applies as of PRTG 20 What data paths does PRTG use to save data? Where does it store the data? What's the location of the local database? Where is the configuration stored? Where are reports stored? Where is the "wri...

This article applies as of PRTG 24  The machine running our PRTG core server does not have full internet access. Which URLs do I need to make available to the core server so I can use the auto-update functionality and automatic software activati...

I run a large PRTG installation with thousands of sensors in my network and want to set up a high-availability cluster for fail-safe monitoring. However, according to the PRTG system recommendations, more than 2,500 sensors in a cluster are no...

This article applies as of PRTG 20 Where can I find articles regarding a cluster setup? Help with the cluster Several articles are available for the different scenarios. General instructions on how to set up a failover cluster: PRTG Manual...

This article applies to PRTG Network Monitor 15.2.17 or later We are an MSP and want to monitor multiple customer locations. We do not have direct access to the customers' networks, so we use Remote Probes to gather monitoring data. How can...

This article applies to PRTG Network Monitor 19 or later I would like to log the delivery of my notifications for troubleshooting purposes. Is there a function to achieve that? Notification delivery logging Extended notification delivery ...

Important notice: The information in this article is outdated. Mini probes are deprecated as the OpenSSL version required to run them is out of support. You can no longer install new mini probes. I want to write my own scripts or programs us...

This article applies to PRTG Network Monitor 19 or later I use the SSL Certificate Sensor to check the status of a certificate. How can I configure the WinHTTP proxy settings to manually define the certificate server? How to configure the Win...

This article applies to PRTG Network Monitor 19 or later Use a Gmail address for PRTG SMTP delivery We successfully tested a Gmail address / Gmail SMTP server for sending out email notifications with PRTG 17.4.33.3251. Settings for Gmail in PR...

This article applies to PRTG Network Monitor 19 or later I need additional information on how to set up an HTTP Transaction sensor, especially on how to find out the correct POSTDATA settings. The HTTP Transaction sensor - tips and tricks By...

This article applies to PRTG Network Monitor 19 or later I would like to have detailed instructions on how to use Cisco's recently implemented NetFlow 9 in ASA 5500 security and firewall appliances. Monitoring Cisco ASA firewalls with PRT...

This article applies to PRTG 22 I need to know which domains are contacted on which port. Also I would like to know if there is a possibility to configure an http proxy for this if http is used. I found settings for an http proxy under notificat...

This article applies to PRTG Network Monitor 19 or later I use the available xFlow sensors of PRTG to monitor traffic of various devices. For example, to measure bandwidth usage data on a Cisco router, I add NetFlow sensors. In the NetFlow senso...

How should I be using the IP FLOW INGRESS & IP FLOW EGRESS commands or should I just use IP route-cache flow ? What's the difference? If you are interested in monitoring flows on a physical interface, you would use ip route-cache flow....

I would like to monitor ingress and egress traffic on a port separately. How do I get individual data for inBound and outBound traffic with PRTG? This article applies to PRTG Network Monitor 14 or later Separating Ingress and Egress Traffic To...

This article applies to PRTG Network Monitor 19 or later I have a PowerShell script either from the Knowledge Base, from Support, or from somewhere on the internet. I am a bit lost, though. How do I install this and what do I need to do to get i...

What is the procedure to backup and restore PRTG? Which folders should I protect? If you want to backup your entire PRTG Configuration including all monitoring data, please refer to this guide If you want to restore a previous configuration...

This article applies to PRTG Network Monitor 12 or later, as well as to previous (deprecated) versions My PRTG configuration seems to be broken. How can I restore a configuration file from automatic backups in order to get back to an earlier con...

This article applies as of PRTG 20 I have an installation of PRTG that I want to migrate to a different system or server. What do I have to do and how can I keep my data files and settings? How to move a PRTG installation to a different syste...

This article applies to PRTG Network Monitor 16 or later I have problems with receiving SNMP data. How can I test my SNMP device on protocol level ? Debug SNMP Problems with the Paessler SNMP Tester With the SNMP Tester you can run simple SN...

This article applies as of PRTG 20 What can I do when my SNMP sensors in PRTG show errors? Are there troubleshooting steps? SNMP and PRTG: Basic troubleshooting Every so often, customers who use PRTG Network Monitor report issues when they s...

I have successfully imported a Mib. But when I try to add the SNMP library Sensor, it's stuck at 'working..' and does not go any further. Any ideas? This article applies to PRTG Network Monitor 16 or later Split MIB File for Use ...

This article applies to PRTG Network Monitor 19 or later I would like to add an SNMP Custom sensor in PRTG, for example, for a particular SNMP counter. But how do I find out which OID I need to use exactly? OIDs for SNMP Custom sensors Objec...

This article applies to PRTG Network Monitor 19 or later I have a device that supposedly supports SNMP. I have been through the List of Available Sensor Types but could not find a sensor that matches my device name or model. Is there a way to m...

What are the most common errors when monitoring WMI and what can I do about them? The Most Common WMI Errors Note: This is only a small overview and we cannot guarantee that we offer the solution to your specific problem here, but it is a s...

This article applies to PRTG Network Monitor 24 I'd like to verify an WMI error/value PRTG is reporting with the WMI Tester. Which fields and classes are used by PRTG for the various sensors? Monitoring via WMI: WQL queries This articl...

This article applies to PRTG Network Monitor 19 or later PRTG was not able to get information from a monitored device to show data in the according System Information table. The error message indicates that PRTG needs access to the devices via p...

This article applies to PRTG Network Monitor 16 or later Is it possible to monitor WMI sensors if the target machine is not part of the actual domain? Monitoring WMI Sensors Outside a Domain If the server on which PRTG is installed is part o...

Every now and then my WMI sensors go into the Down status and report a "Connection could not be established" error. Why is that and what can I do about it? "Connection could not be established" (code: PE015) means that someh...

My WMI sensors in PRTG show errors. What tools can I use for testing things? WMI Tools Overview In order to find reasons why WMI isn't working properly on Windows computers Microsoft has published several tools for testing a lot of aspects ...

There are "WMI Compatibility Options" in PRTG's settings for Probes, Groups and Devices. What do they do? Note: In PRTG version 12.4.4, we replaced "WMI Compatibility Options" with Windows Compatibility Options to take...

This article applies to PRTG Network Monitor 19 or later What are the basics about SNMP, MIB and OID. What do these terms stand for? How do they work? SNMP, MIB, and OIDs—an Overview SNMP is one of the most commonly used technologies when it...

I want to monitor via SNMP but I am not sure which sensor will give me the information I need. Is there an overview to help me find the right sensor? This article applies as of PRTG 20 SNMP sensors in PRTG PRTG Network Monitor offers many b...

This article applies to PRTG Network Monitor 19 or later PRTG has a so-called SNMP Custom Table sensor.  What can I do with it? What are the differences to the SNMP Custom sensor or the SNMP Custom Advanced sensor? How can I set up this sens...

This article applies to PRTG Network Monitor 16 or later Where can I find MIB files for my switch, router or other device that I can convert to oidlib files in order to use it with PRTG? Note: Before you spend your time searching for MIBs and...

This article applies to PRTG Network Monitor 12 or later I want to monitor more counters of APC devices—for example, APC PowerNet—than PRTG provides in its standard SNMP libraries. How can I achieve this? Monitoring Specific Counters of APC D...

This article applies to PRTG Network Monitor 19 or later and MIB Importer 3 or later I want to load MIB files from a device into PRTG. What steps are necessary to convert or import these files into the correct oidlib format to use it for device ...

When I try to import a MIB file from the manufacturer of my network appliance, Paessler's MIB Importer terminates with a "parse error". What can I do? It depends on the kind of error you are confronted with: Missing import modu...

Is it possible to interpret integer values with a description using Lookups?  Example:  OID .1.3.6.1.4.1.318.1.1.1.3.2.5.0 of APC UPS systems. 1 No events 2 High line voltage 3 Brownout 4 Loss of mains power 5 Small temporary power ...

This article applies to PRTG Network Monitor 16.3.25 or later How to set up monitoring for hardware RAID. Monitoring LSI/Broadcom RAID Drives (Physical and Logical) While there are no physical/virtual drive sensors in PRTG for LSI powered RA...

This article applies to PRTG Network Monitor 16.3.25 or later We have multiple stacks of Cisco 2960 switches across campus that we would like to be monitored in PRTG. The problem is that only the top switch has an IP address. In a stack of 3 swi...

This article applies to PRTG Network Monitor 16.3.25 or later How to monitor the status of FRU's (Field Replaceable Units) from my Cisco device using PRTG? Yes, it is possible to monitor the Status of your device's Field Replaceabl...

This article applies to PRTG Network Monitor 19 or later I would like to see MIB entries like the name value of an OID in PRTG instead of just the address with the dot separated numbers. How can I map raw OIDs, that devices return to PRTG, to mo...

I am using an OID that returns the string values "complete", "in-progress", and "pending" for example. I would like this sensor to show a gauge with 3 states. How to accomplish this?  ____ The "correct" s...

This article applies as of PRTG 20 I have created a custom lookup with the range type. When I try to load the new lookup file, I get an error message ('''is not a valid integer value"). Working with range-based lookups This ...

I would like to graph a SNMP string value. Using the SNMP Custom String sensor, I see that the string value is displayed: in the "message" column when I view the all sensors on the device in the "message" column of the Log ...

This article applies to PRTG Network Monitor 16.3.25 or later In my network I have a firewall from FortiGate. We're using the standard sensors in PRTG but this device's operation is very sensitive for my organization and we want to have ...

This article applies to PRTG Network Monitor 19 or later I would like to add new SNMP sensors to my SNMP device. Can I influence the names that are automatically generated for the sensors? PRTG looks up names in the OID tree To create names ...

This article applies to PRTG Network Monitor 19 or later When I monitor certain devices via SNMP, I see peaks in my graph or my graphs show drops. Would it help to change the Overflow Values setting in the SNMP Compatibility Options ? Overflo...

This article applies to PRTG Network Monitor 19 or later I have added an SNMP Trap Receiver sensor to my PRTG installation. It seems that it does not work properly. How can I test if traps are received and if the sensor works? Testing an SNMP...

This article applies to PRTG Network Monitor 19 or later Checklist: Setting up SNMP on Linux Every so often, monitoring devices via SNMP causes issues. We collect the most common problems with SNMP in the article SNMP and PRTG: Basic Troublesho...

This article applies to PRTG Network Monitor 19 or later I would like to monitor my machine that is running on macOS with the SNMP sensors of PRTG. How do I activate SNMP on macOS so that PRTG can query values for disk free, load average, and ot...

Solving "Could not connect" or "Error 10060" Messages when using SNMP If you want PRTG Network Monitor to read traffic data (or other values) from your routers/devices using SNMP (Simple Network Management Protocol) this prot...

This article applies to PRTG Network Monitor 19 or later Are there step-by-step instructions on how to install SNMP on my Windows computer?  Installing and Configuring the SNMP Service on Windows The best moment to install the SNMP service i...

This article applies as of PRTG 21 I use the Windows Update Status (PowerShell) sensor to be up to date on available and installed Windows updates on my machines. However, the sensor is recently throwing errors when it used to work fine in the p...

This article applies to PRTG Network Monitor 16.3.25 or later I work with BGP in my network. I know how to monitor a single peer with the OID, but what I really need is to monitor all of them and find if one of them is in active state. I know th...

Is it possible disable the auto-discovery? The auto-discovery added devices and sensors I do not want to monitor. How can I configure PRTG so that these devices are not added? Automatic auto-discovery is set on group or device level. You can ch...

This article applies to PRTG Network Monitor 19.1.48 or later Various sensors of PRTG require the .NET framework. Which version of .NET has to be installed on my probe systems so that my PRTG installation can run these .NET sensors? Which sensor...

This article applies to PRTG Network Monitor 19 or later I want to avoid the web browser security warning that is shown when using the PRTG default SSL certificate and a secure https connection. How can I get, install, and use such a certificate...

This article applies to PRTG Network Monitor 14.4.12 or later I want to define a different drive letter or another folder / path for my PRTG installation. How can I do this? How to Define a Different Drive or Data Directory for PRTG Installat...

How do I turn off the initial Auto-Discovery? As of PRTG version 21.2.67, the initial Auto-Discovery can be disabled by using the "Custom" Installation Mode during the installation process. For older PRTG versions, there are the fol...

Where do I set the community string for an SNMP sensor? The SNMP Community is considered a credential and as such will be a setting on the "Device Tree" (Head to "Devices" to see the Device Tree). If you're going t...

This article applies as of PRTG 20 I want to log in to the PRTG web interface, but I have forgotten my login name and password. What is the default login? Where can I change my credentials? Credentials for the PRTG web interface In a new in...

This article applies to PRTG Network Monitor 14 or later When I try to connect to PRTG via the Enterprise Console or PRTG Desktop, the software displays a socket error number 10061 and I cannot connect. However, I can still log in to the PRTG we...

This article applies to PRTG Network Monitor 19 or later I want to back up my PRTG data and configuration. How can I do it? Back up PRTG data PRTG Network Monitor writes data to several locations: The program directory (core installation) ...

This article applies as of PRTG 20 I would like to use Office 365 for SMTP delivery instead of the built-in email relay server. How do I have to set up the notification delivery settings in PRTG to send emails via Office 365? Use Microsoft Of...

This article applies to PRTG Network Monitor 16 or later I would like to monitor my Sophos UTM appliance with PRTG but there are no native sensors for Sophos UTM. How can I set up UTM monitoring with PRTG nevertheless? Monitoring Sophos UTM...

I want to get ping sensor, that will only collect information about the availability of a device and will not change its own state. Is this possible? A sensor always indicates the current status of a device for the aspect it is monitoring. For...

I have a PowerShell script either from the Knowledge Base, from Support, or from somewhere on the internet. How do I install this and what do I need to do to get it to work properly? This article applies to PRTG Network Monitor 19 or later G...

This article applies to PRTG Network Monitor 16.4.27 or later I recently installed several Ubiquiti UniFi devices on my network. I have a UniFi Security Gateway (USG), two UniFi AP AC PRO wireless access points, and a UniFi Cloud Key. How can...

This can be done in the device/group settings, in the channel unit settings area. All objects beneath the changed one inherit that setting by default. Note that you may have to recreate the sensors in order for this to be updated to the new units...

This article applies as of PRTG 20 I would like to know the ports that PRTG requires for full access and functionality. Can you please provide a list with all (potentially) used ports? PRTG port usage PRTG requires that several ports on y...

This article applies as of PRTG 23 How to move a PRTG installation to a different system Part 1: Short migration guide This part of the article is meant as a shorter overview of how to migrate PRTG from an old system to a new system. The new s...

Officially we recommend using a Windows Server OS for PRTG. However using Windows 10 should work as well.

This article applies to our on-premise products, Paessler PRTG Network Monitor and Paessler PRTG Enterprise Monitor.  If you receive a License not found error message in PRTG, it is most likely one of the following:  (1) An error in the ...

This article applies as of PRTG 23 I would like to know more about the high security standards of PRTG. Is there a list of PRTG security features? PRTG Network Monitor security features We at Paessler take the responsibility for your netwo...