No access to Linkstation mini (LS-WSXL) after firmware upgrade 1.68

[edp@diamond-fo.com]

After upgrading to version 1.68, it's impossible to access to the data saved into the NAS (before we had the 1.58 version)

Before we had access with few AD user ("\\NAS\SHARE" without give credentials), but now the NAS cannot contact the DC and we can't use it. 

On the "Network" -> "Workgroup/Domain" we are trying to configure it with few domain admin users, but for all we receive this message:
"Unable to access Active Directory domain.
Verify the information in the Active Directory domain information as well as user name and password. Also, verify that your network settings are correct."

The networking data are not changed.

We are trying with a new local user too, but doesn't work too.
when I try to access ("\\NAS\SHARE") it ask the credentials, and then it tell me.
"\\NAS\SHARE" is not accessible.  You might not have permission to use this network resource.  Contacts the administrator of this server to find out if you have access permissions.

Multiple connections to a server or share resource by the same user, using more than one user name,
are not allowed. Disconnect all previous connections to the server or shared resource and try again"


The NAS isn't configured to be a Server Web, a Server MySQL, multimedia server, print server, bittorrent, ...   we just use it to share documents.


The time is synchronized with the DC.


Thx a lot for the help.