Plugin 21745 acts as a built-in troubleshooting alert. It warns security engineers that the scanner's passkey or permission elevation failed, and the local operating system data could not be safely extracted. Technical Causes of Plugin 21745 Failures
Manually trigger a Nessus Plugin Update ( nessuscli update --all ) to ensure the latest assessment logic is being used. Asset Discovery and Assessment - Tenable documentation os security patch assessment failed -21745-
After installing the SSU, reboot and re-run the assessment. Plugin 21745 acts as a built-in troubleshooting alert
Before diving into the fix, it is crucial to understand the mechanism behind the error. While error codes vary by software vendor, the format "OS Security Patch Assessment Failed -21745-" strongly suggests a failure in the data ingestion or API handshake process during a vulnerability scan. Asset Discovery and Assessment - Tenable documentation After
However, based on similar error patterns in mobile device management (MDM), compliance policies (e.g., Microsoft Intune, Samsung Knox, or Android Enterprise), this error typically indicates:
# Test Windows Update Agent integrity Get-WindowsUpdateLog # This creates a log at %USERPROFILE%\Desktop\WindowsUpdate.log