This setting controls the minimum protocol version that the will be attempted to use for IPC$ connections as DCERPC transport. Normally this option should not be set as the automatic negotiation phase in the SMB protocol takes care of choosing the appropriate protocol. The value default refers to the higher value of NT1 and the effective value of . See for a full list of available protocols. The values CORE, COREPLUS, LANMAN1, LANMAN2 are silently upgraded to NT1. client ipc max protocol client min protocol client max protocol default SMB3_11