[Samba] "Incorrectly formatted request" from NT4, "Network responded incorrectly" from SAMBA 'net', trying to join NT4 domain on 4.13, 4.15

[Rowland Penny]

On Mon, 2021-11-08 at 01:46 +0000, Dylan J. Morrison via samba wrote:
> Hi,
> 
> For background, I'm trying to set up a NT4 domain and fileserver for
> sharing files to various retro computers I have lying around. I've
> set
> up the NT4 PDC, which is running a genuine copy of NT4 SP6a on a
> virtual
> machine. My retro machines can successfully talk to this PDC and
> read/write files from it, but Samba seems to be having issues.

It probably would, NT4 only used SMBv1 and since 4.11.0 , Samba
defaults to a minimum of SMBv2
 
> 
> I've tried both Samba 4.13, which is packaged for Debian Bookworm
> which
> I'm running on my fileserver VM, and 4.15, which I compiled myself.
> Both
> produce an error on
> 
>     net rpc join -U Administrator%password -S DIZZY
> 
> of
> 
>    Failed to join domain: failed to lookup DC info for domain
> 'OLDSEP'
> over rpc: The network responded incorrectly.
> 
> 
> I decided to check Event Viewer on the NT4 VM to try to see what the
> issue is. I received the following response:
> 
> 
>    The server received an improperly formatted request from (?)
> 
> 
> I followed this as a configuration guide for a NT4 member server, as
> it
> was the only relevant guide I could find on a quick google:
> 
> https://docs.fedoraproject.org/en-US/Fedora/12/html/Deployment_Guide/s3-samba-domain-member-nt4.html
> 
> My smb.conf is as follows:
> 
> [global]
> workgroup = OLDSEP
> netbios name = FILESRV
> security = domain
> interfaces = eth1
> bind interfaces only = yes
> wins server = 192.168.2.201
> 
> [homes]
> comment = Home directories
> valid users = %S
> read only = No
> browseable = No


Is winbind running ? this is a requirement since Samba 4.8.0
Try adding these lines to your smb.conf

client min protocol = NT1
server min protocol = NT1

You probably also need 'idmap config' lines

Rowland