If you choose to use UNC path names for some or all of your path names in LIBNAME statements or SAS^® System option values (like the WORK= option), you might intermittently receive this error:

It is highly recommended that you use mapped network drive names instead of UNC path names whenever possible. Not only will this ensure that you do not receive this error message, but it will also improve the performance of your SAS I/O. You might be forced to use UNC path names in situations where the SAS session is started remotely, as in the case with a workspace server, and mapped drives are not available.