Failed To Start Playback Netsdk | Returns Error Smart Pss Exclusive

If you are seeing the error message "Failed to start playback. NETSDK returns error" in SmartPSS (or its Amcrest equivalent, Surveillance Pro), you are likely dealing with a communication breakdown between your software and the recording device (NVR, DVR, or SD card).

Likely technical causes (ranked)

1. Exclusive session/resource lock:

   Close Other Apps: Ensure you don't have multiple instances of SmartPSS, DMSS (mobile app), or a web browser session open and streaming simultaneously. If you are seeing the error message "Failed

   Channel Permissions: Navigate to Setup > System > Account and ensure the user profile you are using in SmartPSS has "Playback" rights enabled for that specific camera channel. 4. Address Stream & Storage Issues Exclusive session/resource lock: Close Other Apps : Ensure

   C:\Program Files\Smart Professional Surveillance System\SmartPSS ) with a newer version. Shift the Playback Timeline If software reboots don’t help

   : If live view works but playback fails with an SDK error, the recorder's HDD or SD card may be corrupted or full. : Check the status of your storage in the Dahua Wiki

   Admin Rights: Log into the recorder's web interface or local menu with an admin account.

   Step 5 – Power Cycle the NVR (Hard Reset)

   • If software reboots don’t help, physically disconnect power from the NVR for 30 seconds, then restart.
   • This clears all internal session tables and often resolves “phantom exclusive locks.”