Automatically installed on the Core Server to monitor the immediate network segment.
Even a stable branch has quirks. Here are the top three issues admins face in this version:
: Major versions in this cycle included 21.3.69 (July 2021), 21.3.71 (September 2021), and 21.4.73 (December 2021).
: PRTG supports a wide range of standard protocols including (versions 1, 2c, and 3), NetFlow/IPFIX/sFlow packet sniffing prtg network monitor 21.0.x
Several existing sensors and core capabilities were enhanced in the 2021 releases:
While there isn't a single famous academic "paper" titled exactly "PRTG Network Monitor 21.0.x," this specific version range (released throughout 2021) is significant in technical documentation and cybersecurity research for several reasons: Major Feature Transitions (21.x Releases)
核心服务器的传感器总数应控制在10,000以下，每个探针设备不应超过5,000个传感器。NetFlow和包嗅探传感器对CPU和内存消耗极高，建议每个探针不超过50个。Sensor Factory传感器建议不超过50个，WMI传感器限制在200个以下。扫描间隔不宜设置过短，30秒以上的间隔足以满足绝大多数场景，避免不必要的系统负载和告警疲劳。 Automatically installed on the Core Server to monitor
Are you planning a or an upgrade from an older version?
If you need help tailoring this to your specific infrastructure, please let me know: The you plan to monitor.
PRTG 21.0.x acts as a universal translator for network protocols, eliminating visibility gaps across multi-vendor environments. : PRTG supports a wide range of standard
: Features an "autodiscovery" tool that automatically identifies devices and sets up sensors within minutes.
By version 21.0.x, Paessler hardened security significantly. The core server and remote probes began fully supporting for web server communication and remote probe connections. For organizations facing compliance audits (HIPAA, PCI-DSS), this was a critical upgrade from the 20.x branch.
In , Paessler announced the alpha release of a brand‑new user interface and a completely new RESTful API (API v2) . These features were not fully available in the 21.0.x series but began appearing in 21.1.x and later versions as experimental options.
: The "boots on the ground" that perform the actual monitoring. While the local probe is installed with the core, Remote Probes can be deployed in different subnets or locations to bypass firewall restrictions. Getting Started
If you currently run an older version (e.g., 18.x, 19.x, 20.x), migrating to 21.0.x is a multi-step process: