$ sudo rpcinfo -p <ip freenfs server>
program vers proto port service
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100005 3 tcp 635 mountd
100005 3 udp 635 mountd
100003 3 tcp 2049 nfs
100003 3 udp 2049 nfs

$ sudo mount -o mountvers=3,sec=none <ip freenfs server>:/ /mnt/nfs/home/<DEST> -v
mount.nfs: timeout set for Mon May 23 11:59:20 2016
mount.nfs: trying text-based options 'mountvers=3,sec=none,addr= <ip freenfs server>'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying  <ip freenfs server> prog 100003 vers 3 prot TCP port 2049
mount.nfs: portmap query failed: RPC: Authentication error
mount.nfs: access denied by server while mounting  <ip freenfs server>:/