Prtg Network Monitor 21.0.x <RELIABLE | 2026>

| Issue | Workaround | |-------|-------------| | | 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 |

For cloud services and modern web applications. 2. Core Features of the 21.0.x Release prtg network monitor 21.0.x

This paper was prepared for academic and technical evaluation purposes. Version specifics are accurate as of PRTG 21.0.66.0. | Issue | Workaround | |-------|-------------| | |

Probes execute the actual monitoring work by running checks against target devices. Version specifics are accurate as of PRTG 21

Note: As of 2025, direct downloads from Paessler for 21.0.x may be archived. You typically need an active maintenance contract to access older versions.