Thank you WDC MCH development team. This appeared to have been corrected with the new FW 8.13.1-102. Example MCH device smb.conf shown below, notice the SMB versions and ntlm auth switch that disabled NTLM v1.
netbios name = MyCloud-0AAAAA
workgroup = WORKGROUP
max protocol = SMB3_11
min protocol = SMB2_02
ntlm auth = no
[global]
server string = MyCloudDevice
veto files = /:2eDS_Store/.bin/Network Trash Folder/lost+found/mirrored/uploaded/.AppleDouble/.nflc_data/.wdtmp/.twonky/
security = user
printing = bsd
printcap name = /dev/null
disable spoolss = yes
max log size = 10
guest account = nobody
load printers = no
public = yes
guest ok = yes
passdb backend = smbpasswd:/etc/samba/smbpasswd
use sendfile = yes
strict locking = no
min receivefile size = 16384
smb2 leases = yes
fruit:copyfile= yes
log level = 1
debug level = 1
map to guest = bad user
oplocks = yes
kernel oplocks = no
aio read size = 0
aio write size = 0
ea support = no
load printers = no
printable = no
enable core files = no
create mask = 0775
force create mode = 0775
directory mask = 0775
force directory mode = 0775
local master = yes
domain master = no
preferred master = auto
os level = 5
dns proxy = no
admin users =
unix extensions = no
acl check permissions = false
browseable = yes
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=2048000 SO_SNDBUF=2048000
smb encrypt = disabled
writeable = yes
delete veto files = yes
fruit:aapl = yes
fruit:nfs_aces = no
fruit:veto_appledouble = no
netbios name = MyCloud-0AAAAA
workgroup = WORKGROUP
max protocol = SMB3_11
min protocol = SMB2_02
ntlm auth = no
include = /etc/samba/smb-default-share.conf
[mch3]
path = /shares/mch3
public = no
browseable = yes
available = yes
oplocks = yes
follow symlinks = yes
wide links = no
map archive = no
vfs objects = catia fruit streams_xattr
read list =
write list = "mch3"
invalid users =
valid users = "mch3"
root preexec = analyticlog -l INFO -s Samba -m Samba string:state:"connected"
root postexec = analyticlog -l INFO -s Samba -m Samba string:state:"disconnected"
