I have two DGS Spark and both are able to access via Ethernet from main Windows computer using ssh spark-xxxx.local call. One am I also able to set up via Nvidia Sync, but for the other one I only get an error trying both IP and .local settings. How can this be the case, as far as I can tell both are setup in exactly the same way?
When I had a similar issue, there was a log file in “/Users/username/Library/Application Support/NVIDIA/Sync/logs/” that helped me figure out what was going on. Maybe there is a similar file in Windows?