当客户输入showmount -e 出现mount clntudp_create

NFS问题：
nfs与portmap都正常启动了
 
[root@server /]# showmount -e
mount clntudp_create: RPC: Program not registered
[root@server /]# rpc.mountd
[root@server /]# showmount -e
Export list for server.example.com:
/home *
[root@server /]#