buf.writeByte(0);
// Message type
buf.writeIntLE(NtlmConstants.NEGOTIATE);
buf.writeIntLE(clientConfigFlags.value); // Flags
// If the NTLMSSP_NEGOTIATE_VERSION flag is set by the client application,
// the Version field MUST be set to the current version (section 2.2.2.10),
// the DomainName field MUST be set to a zero-length string, and the
// Workstation field MUST be set to a zero-length string.