| Sensor Type | Improvement | |-------------|--------------| | | Now supports custom request headers and OAuth 2.0 bearer tokens | | SNMP Traffic Sensor | Reduced memory leak issues for high-traffic 10GbE interfaces | | WMI Service Sensor | More resilient to Windows updates and DCOM permission changes | | Ping Sensor | Added jitter and packet loss percentage (previously required scripting) | | VMware Host Health | Compatibility with ESXi 7.0 |

For stable, air-gapped, or legacy environments: . PRTG 21.0.x remains one of the most reliable and resource-efficient major releases Paessler ever shipped. It introduced clustering that worked, a web UI that didn’t lag, and an API that enabled real automation. Thousands of businesses still run it daily—often quietly, without drama.

Additionally, the gained support for Python 3.9+ (older versions were Python 2.7 only). 5. System Requirements for PRTG 21.0.x To run version 21.0.x effectively, your environment needed to meet these specs: