A firmware update was recently released for the NVR6XX-4KS2 series devices.
Information, instructions, and download links can be found Here
Troubleshoot/NVR/Failed to Open Video You Have No Right To Operate
From Dahua Wiki
Failed to Open Video! You Have No Right To Operate!
- Admin access to the recorder
- Access to the recorder directly or remotely
Step by Step Instructions
1. Log into with an administrator account.
2. Go into the Accounts menu on your system and edit the specific profile you are having the error with.
3. Under the Monitor tab enable the camera channel with the error and click save.
4. Log into the modified account, and view the camera channel with the error.