The experience I have had with Storage Spaces has not been good. I had a disk go bad and even though I had redundant storage set up, the system did not rebuild all the stored folders completely and I had to resort to other backups that I kept on another server. Note that Storage Space data is not recoverable if the system goes bad. Drivepool still has the files fully readable just like the old duplication system in WHS V1.
I get the above error dialogue when I run the connector on my Win 10 pro client. Followed the issue resolution on TechNet which say start cert service in IIS on server but this was already running.
I've downloaded the Win 10 connector with no joy also.