In essence, the device is saying: “You cannot view this playback right now because someone else (or another process) has taken exclusive control of this stream.”
To avoid future playback failures, users should manage their system resources proactively. Limiting the number of simultaneous remote connections and scheduling automated reboots for the NVR can keep the NETSDK bridge clear. Additionally, using the newer or DSS Express versions can sometimes offer better stability for modern hardware configurations.
The Dahua NetSDK utilizes specific TCP ports (typically starting at port 37777) to establish data connections with recorders. The SDK is designed to allow only one active instance of the "login" or "playback" handle per application session. If the user attempts to launch a second instance of Smart PSS, or if a background process from a previous session failed to terminate correctly, the second instance attempts to bind to a port or a device channel that the first instance has marked as "exclusive." In essence, the device is saying: “You cannot
Select when Windows prompts you. Restart your computer and test your playback functionality. 3. Verify Account Playback Permissions
: In older versions of SmartPSS (like 2.002), a bug in the dhnetsdk.dll file causes playback to fail even when files exist. You can download a newer version of this file and replace it in the installation folder (usually C:\Program Files\Smart Professional Surveillance System\SmartPSS ). 2. Check Device Connection Limits The Dahua NetSDK utilizes specific TCP ports (typically
: A known issue in Smart PSS version 2.002 involves a bug in the dhnetsdk.dll file that prevents footage from being found or played. : Manually replace the dhnetsdk.dll file in your installation folder (usually
: 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 Restart your computer and test your playback functionality
Common related codes: