Ensure Windows Firewall isn't blocking your application's outbound or inbound requests. Open . Create a new Inbound Rule and Outbound Rule .
If you are a developer, all necessary files (including the HCNetSDKCom folder) must be in the same directory as your application's executable ( .exe ).
Since Error 9 literally means "Failed to receive data," focus on the data pathway.
is often:
A mismatch between the version of the HCNetSDK.dll file built into your viewing app and the physical firmware installed on the NVR/DVR.
| Cause | Description | |-------|-------------| | Wrong password | Password used in login function ( NET_DVR_Login_V40 ) is incorrect | | Default password changed | Device no longer uses 12345 / admin12345 | | Case sensitivity | Password is case-sensitive | | Special characters | Some SDK versions mishandle certain chars | | User locked | Too many failed attempts → temporary lock | | Different user | NET_DVR_Login username is not admin or has no rights |
A less common error that indicates was received from the device. hcnetsdk.dll 9 hikvision error
Are you seeing this error on the or remotely (via internet)? How many cameras are showing this error? Are you using a NVR/DVR or standalone IP cameras ?
The SDK may fail if Windows components like Visual C++ Redistributables or specific .NET versions are missing or corrupt. Summary Table: Hikvision HCNetSDK Error Codes
Try switching the camera's encoding to H.264 in the remote configuration settings to test stability. If you are a developer, all necessary files
A: No. A wrong password usually returns NET_DVR_PASSWORD_ERROR , which is error code 1 , not 9. Error code 9 specifically implies a communication failure regarding data reception.
Access the NVR configuration directly via a web browser. Go to Configuration > Video/Audio > Video . Lower the resolution or decrease the maximum bitrate (Kbps) to reduce the data load on the network. 2. Resolve Network and DNS Bottlenecks
The "hcnetsdk.dll 9 hikvision error" is a multifaceted issue that is generally resolved by or fixing your network data path . Do not be intimidated by the technical jargon. Start with the basics: update iVMS-4200, update your NVR firmware, check your firewall, and ensure your DLL architecture matches your system. For developers, rely on NET_DVR_GetLastError() to verify you are indeed facing a NET_DVR_NETWORK_RECV_ERROR (9) and not a loading issue. | Cause | Description | |-------|-------------| | Wrong
, which strictly indicates wrong credentials.
Before diving into complex configurations, try the most fundamental fix. Often, temporary glitches in the NVR (Network Video Recorder) or DVR (Digital Video Recorder) can cause communication errors.