Prtg Network Monitor 21.0.x 2021 【99% LIMITED】

Paessler PRTG Network Monitor 21.0.x remains a highly dependable "workhorse" for IT infrastructure visibility. Version 21.0 marked a significant period of refinement for the platform, focusing on stability and expanding its signature "sensor-based" monitoring architecture. Overview

Maintenance & Administration

In PRTG 21.0.x, a known quirk (later improved in 22.x) was that PostgreSQL’s autovacuum could fall behind, especially on large custom sensors. prtg network monitor 21.0.x

| Issue | Workaround | |-------|-------------| | NetFlow v9 sensor memory leak | Restart probe service weekly via scheduled task | | Remote probe disconnects over VPN | Increase HeartbeatInterval to 300 seconds in probe configuration | | SNMP v3 sensors fail with authPriv | Downgrade to authNoPriv or update to PRTG 22.3+ | | Web interface slow after 90 days uptime | Restart PRTG Web Server service | | Graphs stop rendering | Clear browser cache or reset \webcache folder | Paessler PRTG Network Monitor 21

Energy Monitoring: New sensor channels can calculate differences between values (Delta), useful for monitoring metrics like power consumption. Need native Grafana integration Want reduced disk I/O

• Need native Grafana integration
• Want reduced disk I/O (newer versions use fewer writes)
• Require OID-based automatic device templates

• HTTP/Sensor v2: Supports HTTP/2 and custom headers.
• Microsoft 365 Sensor Suite: Dedicated sensors for Teams, Exchange Online, SharePoint latency.
• VMware vSphere Sensor: Updated to support vCenter 7.0.
• SNMP Sensor: Improved handling of 64-bit counters (avoiding wrap-around issues).

Probes: 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