DNN Expert posted on April 23, 2010 06:48
Solution was to configure the NTLM security.
From Windows 7, click start, type local and open the Local Security Policy
Manager.
Select Local Policies > Security Options, in the right find Network
Secuity: LAN Manager Authentication Level, and set to Send LM & NTLM - use
NTLMv2 session security if negotiated.