root@virt0:/mnt/nfs# mount.nfs -vvv 172.19.8.25:/home/exports/company2 /mnt/nfs
mount.nfs: timeout set for Thu Mar 31 15:22:54 2016
mount.nfs: trying text-based options 'vers=4,addr=172.19.8.25,clientaddr=172.19.8.131'
mount.nfs: mount(2): Operation not permitted
mount.nfs: trying text-based options 'addr=172.19.8.25'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 172.19.8.25 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 172.19.8.25 prog 100005 vers 3 prot UDP port 33487
mount.nfs: mount(2): Invalid argument
mount.nfs: an incorrect mount option was specified
tail -f /var/log/syslog
...
Mar 31 15:22:49 virt0 kernel: [2504001.096982] NFS reply getattr: -22
Mar 31 15:22:49 virt0 kernel: [2504001.096984] nfs_create_server: getattr error = 22
....