ReadyNas 104 synchronization errors "service unavailable"

Thanks for the prompt reply, i will answer each question in turn:

The Pc's are both on the same lan, 192.168.1.x1 and 192.168.1.x2, the Nas IP is 192.168.1.79.

Yes the readynas admin page works either remotely or locally, i can access it ok from my phones and the share works well from anywhere in the world. what i ever i put on my Nas i can access remotely (thats a direct copy)

I have sent the logs with the Message header in the email title and a link to this thread.

I have been on the forum for a year or so but have never had the need to post before but i appreciate the welcome.

I have tried to limit the Security on the files and directories but that doesnt seem to have had much success, tried re-installing the software (Readycloud desktop app) and obviously have rebooted the Nas drive and updated the firmware but its still not synching backup folders to the nasdrive as it should, some files it will and some it will not. I havnt spotted a pattern, just the annoying beep in windows 10 that synchronization has failed on x director or x file with Service Unavailable

Thanks

Rik