Call NET_DVR_RemoteControl with a no-op command or simply NET_DVR_GetDVRConfig periodically (every 30 seconds) to prevent the device from timing out your session unexpectedly.
If these dependencies are missing, hcnetsdk.dll may load but fail to function, or throw obscure errors. hcnetsdk.dll 23
To help you distinguish between different issues, here are a few other common codes you might see alongside 23: : Incorrect username or password. Call NET_DVR_RemoteControl with a no-op command or simply