: If the error occurs during playback, ensure you are not using a recording template like "Event" on a storage server that only supports continuous recording.

Always use the administrator account when first adding devices to any management software to avoid permission-related errors.

The SDK successfully established a network connection (so no "Network unreachable" error) but the verification of the device's security credentials failed.

Download the latest version from the official Hikvision Portal.

Comprehensive Guide: How to Fix Hikvision Error Code HCNetSDK.dll (23) Verified

: This might seem too obvious, but it's a very common oversight. Using the wrong username or password when adding a device to iVMS-4200 is a frequent mistake, especially confusing the client's own login with the device's admin credentials . While often linked to other errors, repeated failed logins or incorrect credentials can be a root cause.

Method 1: Revert the Recording Template to General/Continuous

Excessive traffic on the network limiting bandwidth for surveillance.

: If the error occurs during playback search, change the storage recording template from "Event" back to "All Day" or "None" if your storage server (like a NAS) cannot process smart events. Check User Management Log in as the Navigate to Remote Configuration User Management

else std::cout << "Login successful. User ID: " << userID << std::endl; NET_DVR_Logout(userID);

Always use the latest version of your software.