We ran a port scan on the filer and it flagged an issue with the portmapper. "Retina has detected that the RPC portmapper service (rpc.portmap) is running on the scanned host. Attackers may use information provided by the portmapper to ascertain the host's operating system and identify other possibly vulnerable RPC services."
In an Network File System (NFS) v3 or NFS v2 environment, portmapper is required. Without portmapper, NFS clients will be unable to mount to the server. Therefore the only way to disable portmapper in Data ONTAP is to disable NFS v2 and NFS v3.
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I'm having the same issue trying to turn off portmap. I've tried disabling and turning off nfs, nfs v2, and nfs v3, but no success. There does not seem to be any command or option to enable or disable portmap itself.