NinjaOne troubleshooting: agents, patching and remote sessions
Working the problems NinjaOne's own knowledge base documents most: devices that show Unknown or never start reporting, pending and rejected devices, duplicates after a reinstall, where the agent writes its logs and how to collect them; Windows patch scans that are missed, run too long or fail with a communication error; NinjaOne Remote sessions that won't connect, Background Mode, maintenance mode and Install Application scripts that fail.
- Level
- Intermediate
- Length
- About 50 minutes
- Contents
- 3 lessons · 1 video · final exam
- Status
- Published · updated 2 Oct 2026
- NinjaOne
Skills you'll practise
- Explain what an Unknown or Unhealthy health status tells you and what to check first
- Tell a pending, rejected and deleted device apart and choose the right action for each
- Find and collect the NinjaOne agent's log files on Windows, macOS and Linux
- Diagnose missed, slow and failed Windows patch scans using the Activity Feed, WSUS settings and the scan schedule
- Work through a NinjaOne Remote connection failure: allowlist, time sync, port 443 and proxy
- Choose when Background Mode and maintenance mode are appropriate and what they suppress
Course outline
- 1.NinjaOne troubleshooting: agents, patching and remote sessionsVideo · 2 min
- 2.Agent health: Unknown, pending, duplicates and logsLesson · 17 min
- 3.Windows patching: missed, slow and failed scansLesson · 17 min
- 4.Remote sessions, scripts and quiet maintenanceLesson · 16 min
- 5.NinjaOne troubleshooting: agents, patching and remote sessions: knowledge checkKnowledge check · 18 questions
- 6.Final exam11 questions · passing it completes the course, so people who already know the material can test out
Sources it draws on
The lessons and questions are written from these references, so learners can go back to the original.
- NinjaOne documentation: NinjaOne Agent Help, frequently asked questions
- NinjaOne documentation: Finding and collecting NinjaOne log files
- NinjaOne documentation: Agent troubleshooting, high CPU and WMI issues
- NinjaOne documentation: Health statuses FAQ
- NinjaOne documentation: Approving devices in NinjaOne, FAQ
- NinjaOne documentation: Agent data deduplication
- NinjaOne documentation: Agent uninstall prevention
- NinjaOne documentation: Windows patch management troubleshooting guide
- NinjaOne documentation: Windows patching, -3005 Windows communication error
- NinjaOne documentation: NinjaOne Remote connection issues
- NinjaOne documentation: Background Mode for NinjaOne Remote
- NinjaOne documentation: Maintenance mode FAQ
- NinjaOne documentation: Install Application script troubleshooting
- NinjaOne documentation: Tokenization installation troubleshooting (macOS)
See it with your own jobs and topics
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