@FRXDQ Ok thank.
Unfortunately nothing else spring to mind. Have you made any manual additions to the smb.conf?
Are their any other forum members who have seen this particular failure, ie the same log entry as is reported by @FRXDQ.
It might be worth doing a general CentOS search on this issue as we do nothing more than control the smb.conf content. Our samba packages are essentially vanilla CentOS so they should work independently of the rockstor code anyway. Let us know how you get on and if you find any more pointers.
Hope that helps.