If your network is configured for Windows NT LAN Manager version 2 (NTLMv2) challenge/response authentication only, make the following change to the smb.conf file:
Log in as root to the Novell ZENworks Network Access Control server (using SSH or login directly).
Open the following file with a text editor such as vi:
/etc/samba-tng/smb.conf
Add the following line:
client ntlmv2 = auto
Save and exit the file.