Linux : mount.nfs: rpc.statd is not running but is required for remote locking

Problem:

# mount -t nfs 10.10.100.20:/vol/test1/NFSDS01 /mnt
mount.nfs: rpc.statd is not running but is required for remote locking.
mount.nfs: Either use '-o nolock' to keep locks local, or start statd.
mount.nfs: an incorrect mount option was specified

But rpc.statd is running
$ ps -ef | grep rpc.statd
rpcuser 2578 1 0 16:18 ? 00:00:00 rpc.statd
rpcuser 4824 1 0 16:21 ? 00:00:00 rpc.statd --no-notify
rpcuser 4867 1 0 16:22 ? 00:00:00 rpc.statd --no-notify
rpcuser 9287 1 0 17:05 ? 00:00:00 rpc.statd --no-notify
rpcuser 10235 1 0 17:15 ? 00:00:00 rpc.statd --no-notify

Solution:

vi /etc/hosts.allow

rpcbind portmap nfsd statd mountd lockd: 127.0.0.1 10.10.100.20 : ALLOW