If all else fails:
If the service starts and then immediately stops, the Windows Event Viewer (under Application logs) will provide a specific error code, such as a .NET Runtime error or a database timeout, which can pinpoint the exact failure point. Conclusion nicelabel proxy service 2017 is not running
Ensure the hosting the NiceLabel Database is online. Check that firewall ports (usually 1433 ) are open. If all else fails: If the service starts