If my master node goes offline, will there be a data gap or can it update from other nodes? How can we ensure accurate billing reports without gaps, especially if both nodes in a 2-way cluster are down at different times? Each node manages its...

This article applies to PRTG Network Monitor 16 or later I have a lot of users in my PRTG and I'd like to see who's logged in and when we reach peaks. Is that possible? Introduction PRTG can't show the currently logged in user...

This article applies to PRTG Network Monitor 14.x.11 or later How can I adjust the timeout for user re-authentication on PRTG system administration pages, or prevent being logged out from admin screens entirely? Defining the Time until Re-...

Where can I find the original GID to reconnect a freshly installed PRTG probe to its server after a hard drive failure? Is it stored on the server?  The GID of a Probe is stored in the configuration file "PRTG Configuration.dat" on t...

Receiving the error message: 209 % Delay (Interval Delay WMI) is above the error limit of 100 % Delay in Interval Delay WMI. WMI Sensors of this probe cannot be scanned in their specified intervals. Try longer intervals or distribute load over p...

How can I get WMI sensors (Disk/CPU/Memory/etc.) to work with a local account on my servers? I've ensured the account has local administrator and Distributed DCOM Users access, but I still get RPC unavailable errors. As you already have se...

Trying to create sensor for asa 5585 and i got this error:  Sensor does not get response from device. SNMP credentials are wrong or device does not support the required uptime OID (1.3.6.1.2.1.1.3.0) for traffic sensors. This OID is mandatory b...

How can I monitor components like web servers, databases, and middleware with PRTG if they don't support WMI or SNMP? Are there agents or alternative methods available? Please note that PRTG does not use agents that are typical for some ot...

I am able to retrieve the SNMP information RFC1213-mib using the SnmpB tool but when I add these variables to the PRTG I get "No such instance (SNMP error # 223) errors messages". "Get" the OID 1.3.6.1.2.1.2.2.1.8.1 using S...

How can I prevent the No Such Instance SNMP error #223 on PRTG when monitoring Dell PowerEdge servers after a reboot, without needing to delete and recreate the sensor or reset the iDRAC (While using PRTG V15.1.15.2022) Since you use an older ...

Cisco system health other ueries for the following channel IDs returned no data: 2,4 (code: PE269) How can I clear this channel indication? To resolve the PE269/SNMP 2003 errors observed when monitoring Cisco 9k devices, you can recreate the i...

Several times a day, our Perfcounter IIS Application pool sensors in PRTG show Down (Unable to connect the specified computer, or the computer is offline. (Performance Counter error 0x800007D0)). The monitored servers are running normally with n...

How can we monitor the expiration time of computer certificates on windows machines? e.g. the computer certificate from a Domain Controller.  PTF.WinCertExpiration This is possible with new Custom Sensor WinCertExpiration. This sensor return...

How can I resolve persistent WMI sensor issues with error PE015, despite all sensors working previously, no errors in the WMI tester, sensors recreated, and tried using both IP addresses and DNS names? Please have a look at the following links...

Having problem sending email notifications to an SMTP relay with authentication. My email service is Office 365 (Exchange Online) recieving this error Error sending Email": Authentication unsuccessful ("pod51028.outlook.com") Ac...

How can I monitor external temperature and humidity sensors on my APC Smart-UPS X 2000 (AP9631) in PRTG? Auto-discovery only lists the internal battery temperature, and importing the APC PowerNet MIB v4.1.9 did not help. Please review t...

Some of our SSL Certificate Sensors show the error: Failed to establish secure connection [Step 0] Socket Error # 10061 Connection refused. [Step 1] Socket Error # 10061 Connection refused. [Step 2] Socket Error # 10061 Connection refused. [Step ...

Updating ESXi hosts to version 6.7 (or specifically 6.7 U1) might lead to warnings appearing in the Hardware Status tab of vSphere Client. These warnings might not be genuine hardware issues. Possible cause for this issue is that the upda...

How do I resolve the "SNMPERR_BAD_SENDTO (SNMP error # -12)" error when adding a sensor for physical disks on a QNAP NAS? You might have an issue on the remote probe in regards to the outgoing IP here... https://kb.paessler.com/en/t...

This article applies as of PRTG 22 In the blog article Logjam Vulnerability: PRTG Is Safe Since Version 14.4.12 (October 2014), PRTG uses pre-generated Diffie-Hellman (DH) parameters with a 1024-bit key by default. Is it possible to enhance ...

I want to change the UDP port number for the SNMP service on my Windows system. Changing the SNMP Port Number on a Windows System In order to change the UDP port number for the SNMP service on Windows systems, you have to edit the SERVICE...

I want to read (traffic) data from my device using SNMP getting an error message "Could not connect" or "Error 10060". Resolve "Could not connect" or "Error 10060" Messages when using SNMP If you want ...

Security aspects to consider when working with SNMP on Windows? Security aspects when working with SNMP on Windows Please check out these articles from Microsoft: Configuring SNMP security on Windows 2000: http://support.microsoft.com/defau...

I have a lot of WMI sensors installed in PRTG. Due to performance reasons, I would like to replace some of them by SNMP sensors. Monitoring Windows Computers via SNMP In order to use SNMP sensors for advanced monitoring of computers, please c...

I have a few devices (switches, routers and a UPS) which are able to send SNMP Traps. My intention would be to include these in PRTGs Monitoring. Is that possible, if so how to do? Important: The following information is deprecated as of...

How can I read the OID `.1.3.6.1.2.1.25.1.2.0` (hrSystemDate) from the Host Resources MIB to check device time against my secure NTP server, given that integer and string returns errors? PTF CheckTimeSNMP With Custom Sensor PTF CheckTimeSNMP ...

Paessler Support asked me to write my Probe State or Status files, how do I do this? Create Probe Status Files In the PRTG web interface, go to Setup | System Administration | Administrative Tools. In the Probe Administrative Tools section, g...

This article applies as of PRTG 22 I have activated CloudWatch metrics in my Amazon Web Services (AWS) account. How much does it cost to use the AWS API to run Amazon CloudWatch sensors? Cost for running Amazon CloudWatch sensors If you c...

I am trying to monitor an XML file via HTTP using the HTTP XML/REST Value sensor, but the sensor returns an error The server committed a protocol violation. Section=ResponseStatusLine The webserver's response is invalid. However, you can ...

This article applies to PRTG Network Monitor 14 through 17.3.33 The HTTP SSL Certificate Expiry sensors in my PRTG installation do not receive any values and show a Down status. The corresponding error message is Could not create SSL/TLS sec...

Can PRTG update a sensor name when a Cisco switch interface description changes? Currently, rescanning creates a new sensor with the updated description, which may cause loss of historical data if the old sensor is deleted. Based on the experi...

This article applies to PRTG Network Monitor 12 or later I would like to toggle the setting for NTFS compression for the PRTG data folder. Formerly, this was a setting in the PRTG Server Administrator tool. Now, that the setting is gone, how...

This article applies as of PRTG 22 What do I have to take into account when planning a large installation of PRTG? Planning large installations of PRTG The maximum number of sensors that you can monitor with one installation of PRTG mainl...

This article applies as of PRTG 22 Why does my Google Chrome browser no longer save my password for the PRTG web interface? Is this due to a PRTG change or a Chrome update? Saving PRTG passwords in Google Chrome browser As of version 37, ...

I set up an SNMP custom sensor to monitor an UPS OID. This OID will return different values for different status. Would it be possible to interpret these integer values with a description string ? It refers to the OID .1.3.6.1.4.1.318.1.1.1.3....

What is the Green IT sensor, and why was it created? What are some useful API calls that can be made on it? Not listed The Green IT sensor is always green. That's it. Please use this sensor type to brighten up your day if there are too ma...

This article applies to PRTG Network Monitor Version 12 or later, as well as to previous (deprecated) versions How can I use a WMI script to reboot a remote computer and set up a custom EXE notification with a notification trigger in PRTG? ...

This article applies to PRTG Network Monitor 7 or later I would like to receive an SMS text message notification to my mobile phone when a sensors goes down. My SMS provider is bulksms.co.uk. How can I do this? Demo 'PowerShell' No...

How can I edit a PRTG device template, to prevent auto-discovery from adding unnecessary Hyper-V network adapter sensors again after I have deleted them? Disclaimer: This is not an officially supported feature I have checked with development ...

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 AP...

Why does monitoring Windows 2012 R2 Messaging Queues from the PRTG master (without a remote probe) time out, even though the Paessler WMI Tester retrieves data successfully? Are there differences between PRTG and the WMI Tester, and are there lo...

This article applies as of PRTG 20 How can I resolve issues where PRTG fails to update or install a remote probe due to an existing Npcap library on my system? Updating or installing PRTG while Npcap is running When you have Npcap 0.995 o...

The probe service just sits on stopping and you cannot force it to stop with access denied. A reboot does not allow the probe to start. Running on Windows Server 2016 There is "quick fix" explained for the issue further down, but bef...

This article applies as of PRTG 20 Is there a way to disable Npcap installation during PRTG updates or installations to avoid conflicts with other applications that use packet inspection? How to disable the installation of Npcap before upd...

PRTG has provided a value (-48dBm as signal level for our wireless link). This value appears under Message column. Is it possible to graph this value? How can I set a notification if this value goes up to -70dBm? Not Listed As for #1, yes. Th...

This article applies as of PRTG 22 Is there a way I can start over and set up my cluster configuration anew? Not Listed Clean up a cluster configuration If you got lost while configuring a cluster, this article will help you renew your c...

Are there any plans to support the SNMP Traffic sensor for devices that lack the sysUpTime OID (1.3.6.1.2.1.1.3.0), or to adjust the sensor's default behavior to work without this OID? The current workaround of creating separate in/out count...

I want to use the multi-platform probe on my Synology. How do I set up a docker container to do this? This article applies as of PRTG 24 and multi-platform probe 3.0.0 Requirements To use this guide, you must meet the following requirements: ...

When configuring PRTG channels, only Channels 5-10 appear, while Channels 1-4 (which are /24 subnets) do not show up. What needs to be changed to display all channels correctly in the Channels tab and on graphs? Not Listed The channels do not...

Is there a recommended approach to find the problems which cause errors with WMI sensors? Can you provide a troubleshooting guide how to solve these WMI issues to get my WMI sensors working? This article applies as of PRTG Network Monitor 13 M...

Does Paessler offer formal PowerShell modules, or do they support the PrtgAPI on GitHub (https://github.com/lordmilko/PrtgAPI)? Paessler does not provide any language specific libraries for interfacing with their API; the only API available fo...

This article applies to PRTG Network Monitor 12 or later How can I use my Linux / Unix / MacOS systems in combination with PRTG? Using Linux/Unix/MacOS with PRTG There are many different ways how you can use PRTG with your Linux, Unix or ...

How do I configure PRTG to alert only for unusually high network traffic and ignore alerts for low traffic periods? There is a Feature Request Post in the KB for more granular unusual detection settings: [OPEN] Enable/Disable Unusual Detectio...

How to monitor Veeam Backup & Replication using Veeam Enterprise Manager? Note: As of PRTG 20.4.64, PRTG comes with a native Veeam Backup Job Status Sensor out of the box. PRTG – Veeam B & R Monitoring Markus Kraus of My C...

This article applies to PRTG Network Monitor 12 or later, as well as to previous (deprecated) versions Why doesn't my PRTG notification execute a batch file when triggered? I selected the batch file and left the parameter field blank, bu...

This article applies to PRTG Network Monitor 15.4.20 or later How can I fix push notification registration for iOS devices in PRTG, given that my iOS devices don't show up under "Notification Contacts," while Android devices re...

This article applies to PRTG Network Monitor 15.4.20 or later How can I fix push notification registration for iOS devices in PRTG, given that my iOS devices don't show up under "Notification Contacts," while Android devices re...

This article applies as of PRTG 22 How does the push notification delivery process work in PRTG, including the roles of the PRTG core server, PRTG Cloud, and mobile devices? The PRTG Cloud and push notifications As of PRTG 15.4.20, you ca...

This article applies to PRTG Network Monitor 13 or later Why does our PRTG probe create connections to an Akamai IP range when monitoring ESX hosts with VMware sensors? Connection Attempts to Akamai CDN Sensors that make use of SSL secure...

Why does the Folder sensor in PRTG fail with "Cannot access folder: The folder doesn't exist (code: PE032)" when added to a device that is not a probe, despite working WMI sensors and adjusting security settings? The folder senso...

This article applies to PRTG Network Monitor 14.4.12 or later I want to use the QOS Roundtrip Sensor with a custom target. How do I set up the PAT rules in my firewalls? How to set up a QOS Reflector with PAT What we tested out here at Pa...

How can I monitor the number of event log messages over a few hours, get alerts if a threshold is reached, and include logs not listed in the WMI EventLog sensor in PRTG? The following sensor will search multiple event logs from multiple provi...

I used the Paessler MIB compiler to change the file to an OIDLIB file but I am not getting all the monitoring points that it should have. The Paessler MIB Importer imports only counters that provide an integer value. It cannot import double-in...

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 modul...

This article applies to PRTG Network Monitor 16 or later Why does PRTG Network Monitor v8 get stuck at "working..." after selecting a NetApp Filer MIB (ONTAP 7.3.3) library when trying to add a sensor, even after successfully impor...

I am curious if there is a way to force 64-bit PowerShell to be used by PRTG? You can also use the failoverclusters module this way. Create a custom sensor that executes a .ps1 script that contains the following line: c:\windows\<sysnativ...

This article applies to PRTG Network Monitor 17 or later I have a Kentix AlarmManager Pro device. How can I use it to send SMS text notifications with PRTG? Configure PRTG for Kentix AlarmManager-PRO Security expert Kentix offers an alarm...

This article applies to PRTG Network Monitor 13 or later I would like to use my Braintower SMS Gateway device to send SMS text notifications from PRTG over it. What do I have to do to set up this SMS gateway and PRTG accordingly? Sending P...

This article applies as of PRTG Network Monitor 18 How can I integrate my SMSEagle Hardware SMS Gateway with PRTG for reliable SMS notifications, and is it possible to monitor the SMS gateway with PRTG? Sending PRTG Notifications via SMSEa...

How can I use remote probes in a PRTG cluster setup? Can they connect to any node, and what happens if the connected node fails? The 15.2.17 stable version offers cluster support for remote probes! This feature is also available in the stable ...

This article applies as of PRTG 22 Are there any recommendations or guidelines what to do if PRTG crashes and it is not possible to restart the program? Guideline for reacting to PRTG crashing If PRTG crashed and you cannot restart it any...

When using a device template for autodiscovery on a new VMware server with the same setup, all sensors configure correctly except for the NICs. How can I ensure only BCK and FRT NICs are detected as per the template? If you are using SNMP Traff...

Is it normal for auto-discovery on switches to add interfaces that are administratively disabled or have no active link? What are the conditions for auto-discovery to add an interface, and can these be adjusted? The auto-discovery always creat...

When I discover a switch it only finds the UP ports, is there a easy way to find them all from stage one, rather than doing a new discovery now and then ? New interfaces will initially be created if the traffic counters are not zero. If the po...

I would like to setup the system to enable connection state handling of all interfaces during the autodiscovery process. Any ideas how I can do that? You can do this by creating a device template yourself, from a device with one SNMP Traffic S...

This article applies to PRTG Network Monitor 15.4.20 or later How can I set up the Business Process sensor in PRTG with a sample use case, such as monitoring my website backend? Monitoring the Business Process “Website Back End”: A Use Cas...

How to prevent .js files to fill up in this location: C:\Windows\System32\config\systemprofile\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5 ?  Unfortunately, this is a known issue of the Internet Explorer, which PRTG pot...

How can I use PRTG to check if my device's IP address is listed on blacklisted servers like sbl-xbl.spamhaus.org, bl.spamcop.net, dnsbl.njabl.org, list.dsbl.org, and multihop.dsbl.org? [UPDATE] Native sensor available: IP on DNS Blacklist ...

This article applies to PRTG Network Monitor 15.3.18 or later The SNMP Printer Sensor shows error "No such object" (SNMP error # 222), what can I do to monitor the fill level of toner cartridges? How to Monitor the Fill Level of ...

Applies to PRTG Network Monitor 15.3.18 and later Can I create a SNMP Custom Table sensor with the same configuration on another device using a template in PRTG? Using SNMP Custom Table Templates Yes, you can create a template from your S...

This article applies to PRTG Network Monitor 7.x I would like to monitor whether my PHP web server is in a good condition. Is there a way to do this? Using phpSysInfo to Monitor the System Health of a PHP Web Server With PRTG Using script...

This article applies to PRTG Network Monitor 14 or later, as well as to previous (deprecated) versions How can I share the status of my network with others, e.g. other departments or management, without disclosing security sensitive data? ...

This article applies to PRTG Network Monitor 12 or later I used the "Send SNMP Trap" notification of PRTG. Is there a MIB file available that I can use on the receiving device? PRTG MIB File You can find the PRTG MIB file in the...

This article applies to PRTG Network Monitor 13 through 16.2.23 When trying to monitor SSH sensors, I get the following error message in PRTG: The negotiation of encryption algorithm is failed. What is the reason for this problem? What can I do?...

This article applies to PRTG Network Monitor 7 or later Is it possible to change the port PRTG uses for its report generation? It seems to interfere with VMware Infrastructure clients (or some other software) on my PC.     Changing the por...

How can I view the last response string of a custom string sensor in PRTG for processing, and how can I test string processing to see the output based on the input and defined processing? If you create a SNMP Custom String sensor that monitors...

Why does retrieving the battery charge value from a Synology NAS DS413's APC Back-UPS work with iReasoning MIB Browser but fail with Paessler SNMP Tester and PRTG, showing a NAN (Unknown data type) error? As of 05/08/2015 PRTG is able to n...

Especially for automatic installation, what command line parameters do you provide for your setup routines, such as PRTG etc.? Which exit codes are given back from the setup files? Command Line Parameters and Exit Codes for Paessler Setups Se...

Are there plans to introduce a PRTG sensor similar to the HTTP XML/REST Value Sensor that can read and monitor JSON output from RESTful web services? Checking JSON With the XML Node (and optional property) field of the HTTP XML/REST Value sen...

How can I enable the auto-discovery log file in PRTG to troubleshoot why a "Windows Updates Status (PowerShell)" sensor isn't created, while SNMP sensors are? Please begin by locating your PRTG's Data Directory on your Core S...

This article applies to PRTG Network Monitor 17.x.34 or later I want to create PRTG libraries to get my own, individual views of the device tree in PRTG. Is there a best practice to help me getting the most out of the libraries feature? Be...

Important note: The option to choose Clickatell as service provider for SMS delivery is deprecated! Clickatell changed the API that PRTG uses to send SMS text notifications, so it is not possible anymore to choose Clickatell as service provider ...

What does the "other" entry in the TopConnections and TopTalkers Toplists mean in PRTG NetFlow or sFlow sensors? The 'Other'-entry is basically the summed rest of all Toplist items beyond the limit of a Toplist. For example t...

Important: The PRTG Data Extractor has been discontinued. There is no further development planned for this freeware tool. You can still use it but we do not provide support for it anymore. We recommend you check out the Paessler PRTG Data Export...

How can I troubleshoot the Could not create the sensor IPMI System Health BETA on the device xxx. The login has failed. Make sure that you entered the correct user name and password. (Code: PE221) error in PRTG, even though the username and passw...

This article applies to PRTG Network Monitor 8 or later The Paessler support team asked me to send my log files. What's the easiest way to do this? Important Note: As of PRTG Network Monitor version 13.3.6, PRTG provides an even easier...

This article applies as of PRTG 21 I would like to install and use a GoDaddy SSL certificate in order to avoid the web browser security warning when starting PRTG’s web interface. How can I achieve this? Using a GoDaddyGeneral SSL Certific...

This article applies as of PRTG 21 I would like to install and use a DigiCert SSL certificate in order to avoid the web browser security warning when starting PRTG’s web interface. How can I achieve this? Using a DigiCert SSL Certificate w...

This article applies to PRTG Network Monitor 16.3.25 or later How can I set up additional sensors in PRTG for my APC UPS to ensure immediate alerts if anything goes wrong, beyond the default monitoring? Advanced Monitoring of APC UPS Syste...

I have a new APC with an expansion card with sensors in it. How do I connect those sensors in PRTG? They are a remote Humidity and Temperature sensor. Update: We have now published a device template for Advanced metrics on APC equipment that i...