hi Kinglong: There has another problem about client mount using nfs4.My server system is ubuntu 14.04. nfs-kernel-server version is 1.3.4.My client system is ubuntu12.04.nfs-common version is 1.2.5.Then i mount the directory using nfs4.But it return "mount.nfs: access denied by server while mounting …".When i mount using nfs3,it's ok.Do you know why? Thanks very much~ houlinfei?韬{.n?壏煯壄?%娝?檩?w?{.n?壏{炳w忐)韰骅w*jg?秹殠娸?G珴?⒏⒎:+v墾妛鑚豰稛??畐娻"穐殢鉂?嗁?