block Null Session Attacks on Windows Server

Edit  registry:
HKLM/System/CurrentControlSet/Control/LSA
Value: RestrictAnonymous=1

show RPC port

for windows2008 and Windows2012

C:\Windows\system32>netsh int ipv4 show dynamicport udp

Protocol udp Dynamic Port Range

---------------------------------

Start Port      : 49152

Number of Ports : 16384

C:\Windows\system32>netsh int ipv4 show dynamicport tcp

Protocol tcp Dynamic Port Range

---------------------------------

Start Port      : 49152

Number of Ports : 16384