EFW 2.5.1 NTLM authentication

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[missinglink]

Hi,
 I have installed new version (2.5.1) yesterday but NTLM auth is not working, there was no problem with this on older version(2.4.1). Error message is:
"Failed to join domain: failed to find DC for domain ." (there is a proper domain name).
 I have found some posts about template modifications, DNS mods, Group Policy for NTLM setting mods, hosts mods and others. Tried most of them but neither worked, probably these issues are related only to older versions.
 
 Anyway, I have successfully configured LDAP (Active Directory on SBS 2011), Endian can see the proper group but trying to join domain always fails. I can see NTLM requests from Endian coming onto SBS interface, Endian is requesting ., not the short name(its because of some modifications but it did not work even with shrt name )

 Can some pls help?

Thank you.
Sopa