What steps should I take if restarting the 'Hikvision Video Service' doesn't fix error 1617?

If restarting the service fails, try resetting the iVMS-4200 configuration. This can be done within the iVMS-4200 client settings. Also, ensure your user account has sufficient permissions to access the service and related files. A complete uninstall and reinstall of iVMS-4200 is often the next best step.