Require message confidentiality option for the Network security: Minimum session security for NTLM SSP based (including secure RPC) servers setting Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Network security: Minimum session security for NTLM SSP based (including secure RPC) servers (2) REG: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0!NTLMMinServerSec