Note: "Closed Loopback Connection" is not an error. It simply means that the connection was closed, and this may be either expected or not.
Possible causes:
- Corona is not activated on the render nodes
- Problem with Autodesk Backburner
- Using special (national) characters in object names, camera name, paths, asset names, etc.
- Problem with Corona installation on the node PC - e.g. there are doubled DLLs in 3ds Max folder, or some files are missing, and because of that 3ds Max or Corona cannot be started
Possible solutions:
- On all render nodes: install Corona and open 3ds Max. Start render and activate licenses.
See: Activating License - On all render nodes: make sure you are able to perform a successful local Backburner rendering without any errors
- Do not use national characters in 3ds Max, paths, or file names