about a samba's problem!

johnnie

[root@localhost samba]# smbclient //192.168.123.131/mnt
added interface ip=192.168.123.131 bcast=192.168.123.255 nmask=255.255.255.0
Password:
Domain=[MYGROUP] OS=[Unix] Server=[Samba 2.2.7a]
tree connect failed: NT_STATUS_BAD_NETWORK_NAME

why?:help