[linux-cifs-client] CIFS Input/output Error

[Hari Sekhon]

Hi,
   I have a problem with cifs in that when I try to mount some shares 
from some machines I get the following error:

mount -t cifs //machinename/pub /mnt/machinename/pub/ -o 
credentials=/etc/mntcreds/administrator
mount error 5 = Input/output error
Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)

The credentials are correct in the credentials file, if I instead do:

mount -t smbfs //machinename/pub /mnt/machinename/pub/ -o 
credentials=/etc/mntcreds/administrator

it works without a hitch, gets mounted and I can browse around the 
filesystem....

So this seems to be a cifs problem. It occurs for me on linux kernels 
2.6.15 and 2.6.16 (.

The machines serving the shares vary from linux machines with samba 
samba-2.0.6-7, samba-2.2.8a-107 and samba-3.0.9-2.6 to new Windows XP 
machines and always fails consistently for those machines, even though 
there are other machines of similar or exact same versions that work 
without encountering this (the majority to not encounter this problem).

I can't think why this would be. Any ideas?