I had come across this too.. intermittently and there was once I need to use a Linux client to access the NFS instead of using CIFS.
It's a little bit confusing when in appliance, you open the share it tells you the CIFS/NFS path like this:
\\<applname>\incoming_patches
(...and actual dir is /inst/patch/incoming/ )
Then in your Windows end, some suggests to use \\<applname>\incoming patches , notice that it does not have the "_" but a space!
I am still trying checking if it's due to different appliance version. Anyone knows exactly the cause?