For customers who are using CIFS/SMB to access data using Windows 2008R2 you must make sure that the hotfix described in Microsoft kb article 2646563 is installed. This fixes a known issue, driving by a timing problem, when SAS data sets are deleted and immediately recreated in the same remote directory.

Based on one customer situation failures were intermittent and occurred about 1 time in 1000 delete/create sequences. In this customer the problem described was an incorrect Authorization refused message.