With Sophos Anti-Virus for NetApp Storage Systems, infected files may not be detected if the C$ (administrative) share is absent. This can happen even if the anti-virus server is running, and is connected to the NetApp filer.
Applies to the following Sophos product(s) and version(s)
Sophos Anti-Virus for NetApp Storage System
What To Do
Check that the administrative share has not been removed from the NetApp filer.