This article applies as of PRTG 22 After purchasing a license upgrade how do I license the same without losing my existing configuration and historic data? PRTG license upgrade Upgrading PRTG is easy. After you have purchased your licen...

This article applies as of PRTG 22   Having trouble with my Paessler PRTG Enterprise Monitor license. It doesn't update automatically, and trying to refresh it in the Setup | License Information section, got this error: "License h...

This article applies as of PRTG 19.2.50 After upgrading PRTG installation to version 19.2.50 having issues with DHCP on any server where I installed a remote probe. Also, there are random DNS server and DFS server issues. What can I do about...

This article applies as of PRTG 22 Guidelines or averages of bandwidth requirements for clustering? For example, an average of 10kbps per 1,000 sensors? Bandwidth usage in a cluster A cluster only transfers changes. If all sensors are ...

This article applies as of PRTG 22 My PRTG installation shows gray sensors in the Unknown state. What does this sensor state mean? Unknown (gray) sensors There can be various reasons why sensors show the Unknown status. See the sections b...

This article applies as of PRTG 22 After restarting the PRTG core server service (but not the probe service), many sensors with long scanning intervals show the Unknown status. Why does this happen, and why doesn't PRTG trigger a rescan ...

This article applies as of PRTG 22 When generating a report with historic data for some sensors, the data is missing, but it appears correctly in the Live Data, 2 days, 30 days, and 365 days tabs in the PRTG web interface. Why is this data m...

This article applies as of PRTG 22 Why can there be performance issues on the PRTG core server or the network when I configure PRTG to perform frequent auto-discoveries of my entire network? Avoid frequent auto-discoveries Depending on...

This article applies as of PRTG 22 I have a Microsoft SQL Server 2008 used for SharePoint, and I need to monitor the database size. How can I do this without using WMI, as UNC paths are not allowed and mapping drives for all databases is ...

This article applies as of PRTG 22 I use the Business Process sensor to get a summarized status for a whole business process involving several components. How is this overall status calculated from the individual components? Summarized sen...

This article applies as of PRTG 22 When adding DHCP sensors to multiple network adapters on a probe system, all sensors only show the network to which the first adapter is connected. PRTG doesn't send DHCP requests via the specified NICs...

This article applies as of PRTG 22 When adding an Exchange Database DAG (PowerShell) sensor, unable to select available databases. What is the cause? Available databases for monitoring Exchange server in a DAG with PRTG The Exchange...

This article applies as of PRTG 22 Use meta-scans when adding custom EXE/Script sensors via auto-discovery. Is there an option to include such scans with device templates? Using the meta-scan functionality for EXE/Script Advanced sensors ...

This article applies as of PRTG 22 Monitoring log files with placeholders using PowerShell and EXE/Script Advanced sensor in PRTG  Monitoring files using placeholders The File sensor can monitor a specific file on a disk if you provide th...

This article applies as of PRTG 22 Is it possible to create a custom SNMP/sensor/app for a web application that can be queried by PRTG? For example, To monitor web app stats (number of purchases, active shopping carts, product searches, p...

This article applies as of PRTG 22 Configuring proxy settings for the HTTP Full Web Page sensor in PRTG Using a proxy with the HTTP Full Web Page sensor The HTTP Full Web Page sensor uses a browser engine to measure the loadin...

This article applies as of PRTG 22 Using XPath with the HTTP XML/REST Value sensor in PRTG Important Notice: The syntax provided in this article is not fully compatible with the HTTP XML/REST Value sensor. This sensor type does not of...

This article applies as of PRTG 22 Setting up an HTTP XML/REST Value sensor to monitor a REST/JSON value, but it returns the error: "Protocol Error: The remote server returned an error. (404) Not Found. Error code: PE023."  Fixin...

This article applies as of PRTG 22 Monitoring backup services via status emails, using regex to trigger an alarm if a backup fails (e.g., "Failed Backups: 0"). This works for plain text emails, but for HTML emails, the sensor in...

This article applies as of PRTG 22 What are some configuration tips for Cisco routers to optimize their compatibility with PRTG Network Monitor, focusing on SNMP-based monitoring and NetFlow protocol setup? Configuration tips for Cisco r...

This article applies as of PRTG 22, as well as previous (deprecated versions). I would like to add my own channels to an existing Packet Sniffer or flow (NetFlow, sFlow) sensor. Is this possible? Update as of PRTG 14.1.10 As of PRTG 14.1...

This article applies as of PRTG 22 I would like to use the SSH sensors of PRTG to monitor my macOS system. How do I enable SSH on this target? Enabling Remote Login on macOS On your macOS system, go to System Preferences and open Sharing...

This article applies as of PRTG 22 What is the filter rule syntax? What flow (NetFlow/sFlow/jFlow) and IPFIX filter parameters are supported by PRTG? Important Notice: This article is no longer kept up to date. For more up-to-date informa...

This article applies as of PRTG 22 How do the channel definitions work for custom packet sniffer, flow (NetFlow, sFlow, jFlow), and IPFIX sensors? Channel definitions for custom Packet Sniffer, flow, or IPFIX sensors When you add custom f...

This article applies as of PRTG 22 NetFlow capabilities of various Cisco switches and routers, including specific models and their NetFlow support, required IOS versions, and potential CPU load impacts for software-based devices. Hardware-...

This article applies as of PRTG 22 I received the sensor error code Connection could not be established (code: PE015) on some of my sensors and they stopped working. How can I solve this? Troubleshooting 'Connection could be not establ...

This article applies as of PRTG 22 I want to export the monitoring data of PRTG to a .csv or .xml file on a daily basis to analyze the data in my own software or import it to Microsoft Excel. How to achieve this? Exporting historic sensor ...

This article applies as of PRTG 22 For update notifications, which URLs does PRTG call in order to contact the Paessler web servers? How automatic update notifications work Auto-update is a powerful feature that helps you keep your PRTG i...

This article applies as of PRTG 22 There are different PRTG apps available for mobile devices. Can I get a feature comparison to decide which PRTG app is right for me? Important Notice PRTG for Windows Phone and PRTG for BlackBerry are di...

This article applies as of PRTG 22 I have enabled ifindex persist on my switch, but the interface numbers still keep changing. I fixed monitoring using the SNMP Compatibility Options with the Port Identification setting, I prefer configuring...

This article applies as of PRTG 22 Our SNMP and SSH sensors occasionally show the Down status with timeout and authentication errors without obvious reasons. What could be causing these issues, and how can I avoid SNMP and SSH sensor instabi...

This article applies as of PRTG 22 Let's compare SNMP-based monitoring, Packet Sniffer, and flow monitoring in PRTG and consider the suitability of each method based on network requirements and available resources, as well as offer insig...

This article applies as of PRTG 22 Let's explore how to differentiate excessive bandwidth usage with PRTG using SNMP-based monitoring, Packet Sniffer sensors, and flow sensors like NetFlow, sFlow, jFlow, and IPFIX.  How to differentiat...

This article applies as of PRTG 22 Using the PRTG API to retrieve historic sensor data in XML, CSV, or JSON formats, including limitations, required parameters, and examples.  Getting historic sensor data from the PRTG API The PRTG API al...

This article applies as of PRTG 22 Takeover process during outages, advises against configuration changes on failover master nodes, and outlines on how to convert a failover master node to a primary master node if needed.  Master node and ...

This article applies as of PRTG 22 I need help with my PRTG installation and possibly found a bug. How can I contact the Paessler support team and easily attach log files and screenshots for assistance? How to contact the Paessler support ...

Excel does not recognize the fields and displays all data in the first column. How do I set the delimiters correctly? Trouble opening CSV files with Excel? The comma and semicolon issue in Excel due to regional settings for Europe When openin...

This article applies as of PRTG 22 Some of my WMI sensors in PRTG show the Down status. The displayed error messages do not begin with an error code in the format 800xxxxx, but have (code: PExxx) appended. What can I do? WMI error messages...

After upgrading, my Amazon CloudWatch, HTTP, and FTP sensors on the same server show errors. Restarting the probe sometimes resolves one, but the others fail. They were fine before the upgrade. How can I fix this? If this message is shown by ...

This article applies as of PRTG 20.1.55 After updating to PRTG 20.1.55 all my Python Script Advanced sensors are in the Down status. What is causing this issue? Python library update and Python Script Advanced sensors PRTG 20.1.55 i...

PRTG reports an error with a PE code. What does that mean? PE error codes - overview PE CodeMessageContextPE001 The IPs do not match. (%0:s <> %1:s) DNS IPs PE002 The target host does not respond. PE003 No remote desktop service is ...

After installing PRTG and scanning my network, I got the following alert:  (003)ixp0 Down No response (check: firewalls, routing, snmp settings of device, IPs, SNMP version, community, passwords etc) (SNMP error # -2003) First, check if the S...

This article applies as of PRTG 22 My WMI sensors keep returning with errors that should not occur. What can I do? I don't want to reinstall Windows on that computer. The repair list for WMI problems WMI is a comprehensive and versati...

The certificate for the PRTG website has expired. I want to renew it using Microsoft Certificate Authority. How do I replace the expired certificate? You can use the PRTG Certificate Importer to import the new certificate. If the tool allows...

This article applies as of PRTG 24 I would like to know if I can use the SSH sensors included in PRTG with my Linux or macOS distribution. On which systems have the sensors been tested? And what about the SNMP sensors for Linux? Linux/macO...

This article applies as of PRTG 22 The Probe Health sensor has the warning The probe system is running out of disk space. Please add additional space to the PRTG data path. What do I do if the available disk space on probe system is running ...

This article applies as of PRTG 22.x.76 I want to access multiple devices via SSH using PRTG's SSH sensors. In the device settings, under Credentials for Linux/Solaris/macOS (SSH/WBEM) Systems, I need to paste a Private Key. What format ...

This article applies as of PRTG 22 List of log status values for the PRTG API Log status values for the PRTG API The following lists contain an overview of possible log status values for the PRTG API. These values are valid for log.htm an...

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. The mini probe on Android device can't...

This article applies as of PRTG 22 What are percentiles in PRTG reports, how does PRTG calculate them, and what impact do they have on the data? Percentiles in reports In reports in PRTG, you get statistically condensed information about ...

This article applies as of PRTG 21.3.70 I run the failover cluster that is built into PRTG. Since I updated my installation to PRTG 21.3.70, I cannot log in to the failover node anymore. What can I do? Change to requirements for login to t...

This article applies as of PRTG 22 How can I run PRTG under a user account with reduced privileges for security reasons? What are the minimum privileges required for such an account? Run PRTG under a different account than the local system...

This article applies as of PRTG 22 What considerations should I keep in mind for regular maintenance and cleanup of my PRTG environment, after setting up devices and sensors for network monitoring? Taking care of your PRTG environment In ...

With the Geo Maps feature in PRTG, it is possible to integrate Google Maps into the PRTG web interface. Are there any limitations that apply when using this Google service? Important Notice: To use Google Maps in PRTG Network Monitor v13 or ...

This article applies as of PRTG 22 Why does the PRTG setup wizard fail to restart the system after an update on Windows Server 2019, showing the error "Setup was unable to restart the computer. Please do this manually"? Manual re...

This article applies as of PRTG 22 I want to know the options for using a secure connection to the PRTG web interface. 1. What possibilities do I have to connect securely? 2. Can I disable SSL and use an insecure connection? 3. How do I h...

This article applies as of PRTG 22 How can I clear port 80 for use by another application if PRTG is set to SSL and all web interface connections go through port 443? PRTG automatically determines which ports to use You set the PRTG web s...

This article applies as of PRTG 22 Is there a way to remotely and silently uninstall remote probes from our PRTG monitoring infrastructure, especially when we no longer have direct access to the client’s computer where the probe is running. ...

This article applies as of PRTG 22 In case the master node fails and a different cluster node becomes master node: How does a user know the URL of the correct web interface? Is there an automatic redirection? Manually enter a cluster node ...

This article applies as of PRTG 22 How does PRTG calculates CPU, Traffic, and Response Time Index values based on sensor measurements and historic peak values and provide a quick status overview of the network?  How does PRTG compute CPU I...

This article applies as of PRTG 22 How can I reduce the number of sensors shown under "Most Used Sensor Types" in PRTG when adding a sensor to a device? Is it possible to disable or hide "Most Used Sensor Types" entirely?...

This article applies as of PRTG 23 Add the Active Directory Replication Status Errors sensor without Active Directory (AD) admin rights. How to add the Active Directory Replication Errors sensor without AD admin rights Follow the below st...

This article applies as of PRTG 22 How can I prevent receiving multiple notifications from branch office devices when an access point is down, ensuring sensors/devices do not send notifications if the connection to the main office is interru...

This article applies as of PRTG 22 Is it possible to set up a Ping sensor that shows a green OK status if a device is not reachable and a red Down status when a device is reachable? Inverse ping with a Windows script file With an EXE/S...

This article applies as of PRTG 22 My HTTP Advanced sensors are showing different values in the Bytes Received channel. What is causing this? HTTP Advanced sensor and differing values When requesting URLs, the HTTP Advanced sensor may sho...

This article applies as of PRTG 22 My Oracle Tablespace sensor went to the Down status and is showing negative values. What is causing this and is there any way to fix it? Oracle Tablespace sensor and negative values If your Oracle Tablesp...

This article applies as of PRTG 22 I created a PerfCounter Custom sensor to monitor several performance counters on operating system but I received the error message: The specified object is not found on the system. (Performance Counter erro...

This article applies as of PRTG 22 I want to use the OPC UA Custom sensor. What kind of OPC UA data types is it compatible with? OPC UA data types that the OPC UA Custom sensor supports The OPC UA Custom sensor supports the following O...

This article applies as of PRTG 22 The IMAP sensor shows Down status even if there have been new emails related to backup status within the time span set as error threshold (for example, within the last 48 hours). Message age check with th...

This article applies as of PRTG 22 Can I create a sensor to alert the PRTG system admin if the number of Down, Paused, or Unknown sensors exceeds a specific threshold, essentially warning when too many errors are detected? Monitoring senso...

This article applies as of PRTG 24 Use of Script v2 sensor sample python scripts offered by PRTG for tasks like remote monitoring and parameter usage. Script v2 sensor example scripts As of PRTG 23.x.82, users can add the Script v2 sensor...

This article applies as of PRTG 24 With so many sensors, sometimes there is too much detailed information to show  non-technical co-workers. How can I get one overall status for the whole "email" process to see if the email system ...

This article applies as of PRTG 22 After adding SNMP Cisco ASA VPN Users sensor to PRTG installation, it changed to the Down status with the error message:  The sensor exceeded the maximum number of 50 users. For more information, see https...

This article applies as of PRTG 22 The SNMP Dell PowerEdge Physical Disk sensor does not work with some hard disks on the host and returns the following error message:  The validation of at least one of the new objects failed because of the...

This article applies as of PRTG 24 After updating the iDRAC firmware on Dell servers, the SNMP Dell System Health PowerEdge sensor now shows an error message:  Error by lookup value ‘Other’ in Power Status SNMP Dell PowerEdge System Healt...

This article applies as of PRTG 22 Is there an overview available on which lookup values the SNMP HPE Proliant Memory Controller sensor supports? Lookup values for the SNMP HPE ProLiant Memory Controller sensor All possible Error status v...

This article applies as of PRTG 22 After adding an HPE ProLiant server iLO device and updating the SNMP settings, I added HPE ProLiant System Health and HPE ProLiant Physical Disk sensors. However, the disk sensors only report 'Disk Stat...

This article applies as of PRTG 22 Set up the AWS Cost sensor to monitor the costs of my Amazon Web Services (AWS) account. Settings in the AWS account related to the AWS Cost sensor Define the following settings in the Amazon Web Service...

This article applies as of PRTG 24 How does PRTG interpret "kbits per second" in the SNMP RMON sensor's primary channel? Is it the sum of incoming and outgoing traffic, like the SNMP Traffic sensor's Total channel, or does ...

This article applies as of PRTG 24 After a Windows update, the WMI Microsoft SQL Server 2005 sensor does not work anymore. What is the reason for this? Deprecated sensor type WMI Microsoft SQL Server 2005 With the latest updates of SQL Se...

This article applies as of PRTG 22 I would like to add custom text labels to a map view, but I can only find predefined images. How can I create a map object that shows a custom text box? Adding a textbox to a map You can add a simple tex...

This article applies as of PRTG 24 In the channel settings of some sensors I have the option to select a value mode. What are the differences between these three modes? Value Mode in channel settings PRTG has a special channel setting for...

This article applies as of PRTG 24 Set specific scan times for PRTG sensors using the @ UTC hh:mm format in the PRTG web interface, with examples and notes on performance and time zones.  How to set specific points in time as a scanning ti...

This article applies as of PRTG 24 When I want to generate a PDF report for a larger number of sensors, there is a timeout during report creation. PRTG throws the error message Error creating PDF report: [...]. How can I resolve this? Erro...

This article applies as of PRTG 24 What can I do if I run into issues with my PRTG for iOS app? Are there any troubleshooting solutions? Issues with PRTG for iOS and troubleshooting solutions Important Notice: This article is work in prog...

I want to share my ideas and feedback about PRTG and want to know about upcoming developments. How can I provide feedback and receive information about new products and features? How to provide feedback about Paessler PRTG and receive dev...

This article applies as of PRTG 22 How to achieve additional security when signing in to PRTG using Okta? As of PRTG 22.x.76, you can use Okta as a single sign-on (SSO) provider in PRTG with multifactor authentication (MFA). Using MFA prov...

This article applies as of PRTG 22 What can I do if I run into issues with my PRTG for Android app? Are there any troubleshooting solutions? Issues with PRTG for Android and troubleshooting solutions Important Notice: This article is wo...

This article applies as of PRTG 24 Difference between "HTTP" and "HTTP Full Web Page" web server sensors The HTTP Full Web Page sensor uses a web browser instance to fully load an entire web page (including all embedd...

This article applies as of PRTG 24 After installing the PRTG update to version 14.4.12, the SNMP HPE ProLiant System Health sensor is suddenly showing the Down status on several systems at the same time with the error message is Error in Ove...

This article applies as of PRTG 24 What rules should I adhere to when configuring custom WMI sensors in PRTG to monitor WMI counters not covered by built-in sensors? How to add your own WQL queries using WMI Custom sensors Use Windows M...

This article applies as of PRTG 23.2.84 The SNMP Custom v2 sensor now supports certain MIB folders. Which ones are supported and how do they work? Previously, in order to import MIB files from your devices into PRTG, you had to use the PRT...

This article applies as of PRTG 24 I use Open Street Map data for viewing geographical maps in PRTG (via MapQuest or CloudMade). However, when I enter a street address, it is not shown on the map. What can I do? Open Street Map data You...

This article applies as of PRTG 24 When configuring SMS delivery in PRTG and selecting an SMS provider from the list of providers, what exact URLs does PRTG use to deliver SMS messages. Do I need to configure any ports in my firewall? SM...

This article applies as of PRTG 24 How can I configure notifications in PRTG specifically for sensors with priority 5 while excluding others from triggering these notifications? Notifications for sensors in libraries You can add notific...

This article applies as of PRTG 24 When sending an SMS text message notification via bulksms.de, got this error message: Error sending "SMS": Number=+1555123456, Message=Socket Error # 10060 Connection timed out. Connection timeo...

This article applies as of PRTG 24 When loading the Map Designer on my PRTG installation with more than 5,000 sensors, my browser (Firefox) shows a message: Warning: Unresponsive script  A script on this page may be busy, or it may have st...

This article applies as of PRTG 24 We are using PRTG Network Monitor 13.1.1.1182 and need an all-in-one sensor to monitor Dell PowerEdge servers directly via the iDRAC SNMP interface, which provides comprehensive hardware information. At t...

When connecting to the PRTG web interface with a self-signed certificate, Google Chrome shows the security warning message “Your connection is not private”. Is there a possibility to prevent this warning? This article applies to as of PRTG 15....

This article applies to as of PRTG 12 or later I would like to remotely restart a Windows service on a target machine in the network of my PRTG core server. How can I do this automatically? Automatically Restart Windows Services This func...