Réseau nfs impossible à monter sur le client

Bonjour,

j'ai un problème de montage de dossier partagé par un serveur nfs

voici sur le serveur (192.168.0.11):

/etc/exports:
# /etc/exports: the access control list for filesystems which may be exported
# to NFS clients. See exports(5).
#
# Example for NFSv2 and NFSv3:
# /srv/homes hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)
#
# Example for NFSv4:
# /srv/nfs4 gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
# /srv/nfs4/homes gss/krb5i(rw,sync,no_subtree_check)
#
/home/nfs 198.168.0.12/255.255.255.0(rw,all_squash,no_subtree_check,anonuid=65534,anongid=65534)

le uid et gid 65534 correspond à ce que j'ai trouvé dans les fichier /etc/passwd et /etc/group, à la ligne nobody et nogroup, sur le serveur.

/etc/hosts.deny :
# /etc/hosts.deny: list of hosts that are _not_ allowed to access the system.
# See the manual pages hosts_access(5) and hosts_options(5).
#
# Example: ALL: some.host.name, .some.domain
# ALL EXCEPT in.fingerd: other.host.name, .other.domain
#
# If you're going to protect the portmapper use the name "rpcbind" for the
# daemon name. See rpcbind(8) and rpc.mountd(8) for further information.
#
# The PARANOID wildcard matches any host whose name does not match its
# address.
#
# You may wish to enable this to ensure any programs that don't
# validate looked up hostnames still leave understandable logs. In past
# versions of Debian this has been the default.
# ALL: PARANOID
ALL: PARANOID

/etc/hosts.allow
# /etc/hosts.allow: list of hosts that are allowed to access the system.
# See the manual pages hosts_access(5) and hosts_options(5).
#
# Example: ALL: LOCAL @some_netgroup
# ALL: .foobar.edu EXCEPT terminalserver.foobar.edu
#
# If you're going to protect the portmapper use the name "rpcbind" for the
# daemon name. See rpcbind(8) and rpc.mountd(8) for further information.
#
portmap: 192.168.0.12
lockd: 192.168.0.12
rquotad: 192.168.0.12
mountd: 192.168.0.12
statd: 192.168.0.12
nfsd: 192.168.0.12

toujours sur le serveur, je lance le partage:
service nfs-kernel-server restart

et quand j'essaye de le monter chez le client 192.168.0.12 :
mount -v -t nfs 192.168.0.11:/home/nfs /mnt/nfs
mount.nfs: timeout set for Fri Jun 5 02:30:08 2015
mount.nfs: trying text-based options 'vers=4,addr=192.168.0.11,clientaddr=192.168.0.12'
mount.nfs: mount(2): Permission denied
mount.nfs: access denied by server while mounting 192.168.0.11:/home/ftp

pour info, sur le client:
ls -l /home
drwxrwxrwx 2 nobody nogroup 4096 juin 4 00:33 nfs
(j'ai omis les répertoires des autres utilisateur)

je ne comprends pas où est l'erreur

quelqu'un a une idée?