A common cause is a bug in certain versions of SmartPSS (like 2.002) where the SDK file fails to communicate with newer firmware. : Download a fresh dhnetsdk.dll

: Run the application as an Administrator to ensure it has the necessary network and file system rights. ⚠️ Potential Software Issues How to run SmartPSS as an Administrator on a User account

: If the recorder thinks a previous session is still active, it may block new ones. A physical reboot of the NVR/DVR often clears these "ghost" connections. 3. Verify Account Permissions

: Conflicts between the PC time and the NVR time—especially during DST transitions—can cause the SDK to request a file at a timestamp that technically "doesn't exist" in the index, leading to a return error. Ensure both your PC and NVR are synced to the same NTP server.

If manual DLL replacement resolved your issue, consider keeping a copy of the working .dll file in a safe location. When you update SmartPSS in the future, the installation may overwrite the DLL with a problematic version — having a backup allows you to revert quickly.

Under the or Playback tab, ensure all cameras have the necessary rights enabled. Save and restart the application. 4. Optimize Network and Connection

Does this error happen on or just one specific camera ?

The error "Exclusive" implies the stream is reserved for one user. Check if someone else (or another software like BlueIris, Milestone, or a mobile app) is currently viewing that specific camera. If another device is pulling the "Main Stream" (HD), and the camera is set to "Single Stream" mode, SmartPSS will be rejected.

For users who save recordings directly to a local NAS or hard drive, the error can also occur when attempting to play back a specific corrupted file. Interestingly, in many such cases, the same file plays correctly if opened via , suggesting that the timeline‑based playback method is more sensitive to file integrity issues than direct file opening.

Sometimes the software background process hangs, causing "exclusive" access errors.

: The active user account lacks authorization to access playback logs.

This resolves the "Ghost Process" conflict.

Does this error happen on or just a specific one, and are you using a local IP or a P2P serial number to connect? Smart PSS Error Help | IP Cam Talk