AIX 与LINUX NFS文件共享配置 报错，RPC Error: Program not registered.

aix 是server，client 是Linux，

[root@test ~]# mount -t nfs 139.13.8.201:/tmp/nfs/ /mnt/nfs/
mount: mount to NFS server '139.13.8.201' failed: RPC Error: Program not registered.