Limit of simultaneous mount cifs processes?

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Hi!

I am using the following command to mount a folder of my Windows 7 computer to a cluster of several Linux machines

mount -t cifs //windows7-computer/folder-to-mount /home/sonia/mnt-folder -o user=windows_user,pass=windows_password,uid=linux_user,gid=linux_group

I need to mount the "folder-to-mount" about 40-50 times simultaneously to different "mnt-folders".

But I have found that I cannot do this. 
It seems that there is a kind of limit that only allows me to mount the "folder-to-mount" about 12-14 times simultaneously.

Why is this happening?
Any hints on how to solve this problem?

The error message that I get is the following,

mount error(5): Input/output error
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

cifs.ko is the following

filename:       cifs.ko
version:        1.61
description:    VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows
license:        GPL
author:         Steve French <sfrench@xxxxxxxxxx>
srcversion:     6EEAB9465787AE0C514101E
depends:        
vermagic:       2.6.32-24-server SMP mod_unload modversions 
parm:           CIFSMaxBufSize:Network buffer size (not including header). Default: 16384 Range: 8192 to 130048 (int)
parm:           cifs_min_rcv:Network buffers in pool. Default: 4 Range: 1 to 64 (int)
parm:           cifs_min_small:Small network buffers in pool. Default: 30 Range: 2 to 256 (int)
parm:           cifs_max_pending:Simultaneous requests to server. Default: 50 Range: 2 to 256 (int)

cat /proc/fs/cifs/DebugData gives

Servers:
1) Name: xx.xxx.xx.xxx  Domain: UN Uses: 1 OS: Windows 7 Professional 7600
NOS: Windows 7 Professional 6.1Capability: 0x1e3fc
SMB session status: 1TCP status: 1
Local Users To Server: 1 SecMode: 0x3 Req On Wire: 0
Shares:
1) \\windows7-computer\Users Mounts: 3 Type: NTFS DevInfo: 0x20 Attributes: 0xc700ff
PathComponentMax: 255 Status: 0x1 type: DISK DISCONNECTED 

MIDs:

2) Name: xx.xxx.xx.xxx  Domain: UN Uses: 1 OS: Windows 7 Professional 7600
NOS: Windows 7 Professional 6.1Capability: 0x1e3fc
SMB session status: 1TCP status: 1
Local Users To Server: 1 SecMode: 0x3 Req On Wire: 0
Shares:
1) \\windows7-computer\Users Mounts: 10 Type: NTFS DevInfo: 0x20 Attributes: 0xc700ff
PathComponentMax: 255 Status: 0x1 type: DISK DISCONNECTED 

/var/log/messages shows

Dec 28 17:00:40 sonia-v1 kernel: [ 6941.421070] Status code returned 0xc00000d0
NT_STATUS_REQUEST_NOT_ACCEPTED error in SessSetup = -5
Dec 28 17:00:40 sonia-v1 kernel: [ 6941.422241] Status code returned 0xc00000d0
NT_STATUS_REQUEST_NOT_ACCEPTED

Regards,
Sónia


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