cifs WinXP problem

Sorry to trouble you with what may be a Microsoft problem. On my LAN, I replaced one of my Win2k boxes with a new WinXP box. I use cifs to connect with MS boxes from an FC7 box. Here is the main part of the start script in init.d : case $1 in start) mount -t cifs -o user=administrator% xxx,noauto,suid,dir_mode=0700,file_mode=0700 //abcd30/base /mnt/base30 mount -t cifs -o user=administrator% xxx,noauto,suid,dir_mode=0700,file_mode=0700 //abcd10/mike_local /mnt/ mike_local_10 abcd30 is a Win2k box. abcd10 is the new WinXP box; mike_local is a share name on a directory. abcd30 connects correctly; for abcd10 I get: # smb start mount error 5 = Input/output error Refer to the mount.cifs(8) manual page (e.g.man mount.cifs) The man page says little of errors. I note that: ping works fine; the new box and its shared directory are visible from other Win boxes; the real passwords are the same on both boxes and have no inappropriate characters. I tried shutting down iptables and ZoneAlarm (with WAN disconnected, of course). Thanks for your help. Mike.