linux挂载问题

[root@localhost root]# smbmount //172.19.23.21/aa /mnt/windows -U administrator
/mnt/windows:invalid option --U
2838:session request to 172.19.23.21 failed (Called name not present)
2838:session request to 172 failed (Called name not present)
Password:
Anonymous login successful
2838:tree connect failed:ERRDOS - ERRnaoccess (Access denied.)
SMB connection failed
[root @localhost root]#
能ping通网络，smb 服务也启动啦，防火强也关闭了，但还是出现这个问题。请问，这个问题怎么解决。