Check user permissions

Ensure your user account on the NVR has non-exclusive playback rights. Some devices have an “exclusive stream” option that limits access. Check other clients – Is anyone else accessing

1. Check other clients – Is anyone else accessing the NVR (including mobile apps, web login, or another PC)?
2. Reboot SmartPSS – Fully exit (including system tray) and relaunch.
3. Test a different channel – Try playback on a camera you haven’t accessed recently. If that works, the issue is channel-specific.
4. Test via web browser – Log directly into the NVR’s web interface and try playback on the problematic channel. If it fails there too, the NVR itself is stuck.

When to escalate to vendor support

• Open Task Manager → Processes tab.
• End all SmartPSS.exe, SmartPSSClient.exe, or NetSDK related processes.
• Restart SmartPSS and test playback.

B. Background Processes or Stuck Sessions

Restart the SmartPSS Client:

Close the application entirely. Use the Task Manager (Windows) or Activity Monitor (Mac) to ensure all "SmartPSS" and "NVR" processes are killed before restarting. When to escalate to vendor support