This command was introduced in the LAN Manager 1.0 dialect. It is now obsolete.

This command was used to negotiate security packages and related information, but is no longer used. Documentation describing the implementation of this command can be found in [XOPEN-SMB]  section 11.2. Clients SHOULD NOT send requests using this command code. Servers receiving requests with this command code SHOULD return STATUS_NOT_IMPLEMENTED (ERRDOS/ERRbadfunc).<108>