Locate all instances of , Smart Professional Surveillance System , or PC-NVR . Right-click each process and click End Task .

SmartPSS is convenient, but the manufacturer's web interface for your NVR is the most direct connection and is more likely to work. If playback works in the web GUI, as is often the case, it confirms your NVR, hard drives, and recordings are working correctly. Use the web GUI for urgent reviews, then troubleshoot SmartPSS at your convenience.

If the classic SmartPSS platform continues to experience driver exceptions on modern Windows operating systems, migrating to updated, official companion programs usually solves the underlying problem:

NVRs and DVRs have hard limits on concurrent playback streams. If other users, mobile apps like DMSS, or integrated video management systems (VMS) are accessing the same stream channel, the NVR rejects new requests with an exclusive resource block.

Double-check your system's configuration settings:

This article provides a comprehensive guide to resolving the issue in Dahua SmartPSS, a common error that often occurs when trying to view recorded footage.

If the error occurs at a specific time, it could be related to daylight saving time changes or database index errors. Try selecting only instead of multiple cameras.

Obtain a stable version of the dhnetsdk.dll library file directly from an official Dahua Wiki Support Page or trusted supplier portal.

The error is a resource lock conflict, not a hardware failure. In most cases, terminating all SmartPSS processes and restarting the software resolves the issue. If persistent, reboot the NVR/DVR and ensure no other application is accessing the same camera channel simultaneously.

When Smart PSS says "NetSDK returns error," it means the software sent a command to the NVR requesting a video stream, and the NVR sent back a rejection packet. The most common hidden error code associated with this message is 0x07 or 0x01 , which translates to or "Exclusive mode locked."