The value of the parameter (a string) is the lowest SMB protocol dialect than Samba will support. Please refer to the parameter for a list of valid protocol names and a brief description of each. You may also wish to refer to the C source code in source/smbd/negprot.c for a listing of known protocol dialects supported by clients. If you are viewing this parameter as a security measure, you should also refer to the parameter. Otherwise, you should never need to change this parameter. CORE NT1