Backup error 1400

I have some troubles with backup (syncro). It is between two my cloud mirros devices. initially it worked a couple of times. then stopped working. Again it worked a couple of times. Now it stopped at all. It says error 1400. Can you help with that? thanks.

Ho configurato un backup tra due mycloud miror e inizialmente fuinzionava. Poi ha smesso di funzionare, ha ripreso nuovamente, e ora ha smesso di nuovo. Segnala error 1400. qualcuno può aiutarmi? grazie

Hello and welcome to the WD community.

In order to get better assistance would you be more specific on when you get this error, or how you get it. 

thanks for your answer. I get the error when the backup go on