I can provide specific for your exact device once I have those details.
Follow these troubleshooting procedures in order, from the quickest configuration adjustments to more advanced software fixes. 1. Clear Stale Network Sessions
The symptoms of this error may vary, but common issues include: I can provide specific for your exact device
: Non-administrator user roles assigned to the device might have live-view privileges but lack the explicit "Monitor/Playback" permissions required to read archival records. Step-by-Step Troubleshooting Solutions
This is the most common cause. When Smart PSS is closed, the main window disappears, but the SmartPSS.exe or NetSDK.exe process may remain running in the Windows Task Manager. These "ghost" processes maintain an active lock on the network ports. When the user reopens the software, the new instance conflicts with the locked resources of the ghost process. Clear Stale Network Sessions The symptoms of this
Sometimes the error is a masked "Permission Denied" message. : Log into your NVR/DVR directly as an admin. Go to the
C:\Program Files\Smart Professional Surveillance System\SmartPSS These "ghost" processes maintain an active lock on
a working dhnetsdk.dll file (many users have found success with updated files provided by support channels, such as this example from Cornick Support).
generally indicates a communication failure between the SmartPSS software and the Dahua (or rebranded) recorder's SDK
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.