autofs option to support nfsv3 on linux 7 host (oel7/rhel7/centos7)

It's found that on linux 7 hosts, accessing autofs will default to use nfsv4, so if the NFS server do not support nfsv4, then we can change at NFS client side to force use of nfsv3:

/net -hosts -intr,rsize=32768,wsize=32768,hard,nolock,timeo=14,noacl,mountvers=3,vers=3

Restart autofs (systemctl restart autofs) and you should be able to access now.

Good Luck & Best Wishes