I Have a partition called D: shared at a Windows machine, and In my Ubuntu server 12.4 I Have this line at fstab to mount it

//10.0.0.39/D$/ /mnt/charles/ cifs user,file_mode=0777,dir_mode=0777,rw,gid=1000,sec=ntlmv2,credentials=/root/creds 0 0

I've added the option "sec=ntlmv2", because was appearing this message every time I boot/reboot my ubuntu.

CIFS VFS: default security mechanism requested. The default security mechanism will be upgraded from nbtlm to ntlmv2 in kernel realese 3.3

Now I can't mount with this "sec=ntlmv2" option, because appear to me.

mount error(22): Invalid argument

Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

Can someone help? Thanks in advance!

This is the result with --verbose, what this can help to find the problem?

root@PITCAIRN:/mnt# mount -t cifs //10.0.39/D$/ /mnt/charles --verbose -ouser=Yamash,sec=ntlmv2 

Password: 

mount.cifs kernel mount options: ip=10.0.0.39,unc=10.0.39D$,sec=ntlmv2,ver=1,user=Yamash,pass=********

mount error(22): Invalid argument 

Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) 

--EDIT--
Zetrocker came with the solution, I changed the "sec=ntlmv2" to "sec=ntlmssp" and now it's working.

Thanks Zetrocker