[Samba] Ubuntu Samba Upgrade Problem

[Rowland penny]

On 06/02/2021 21:46, Robert Steinmetz via samba wrote:
> I upgraded a Ubuntu 18.04 LTS samba to 20.04 yesterday Testing it I 
> find the Samba part of the server is no working properly.
>
> The new Samba Version 4.11.6-Ubuntu. The PDC is running 4.7.6-Ubuntu. 
> I plan to upgrade the PDC as soon as I finish this one.
>
> The server is a MEMBER SERVER of a NT4 style domain. smbd, nmbs and 
> winbind are running but wbinfo and getent don't seem to be getting 
> anything. I cannot browse the computer.
>
> I have not edited the smb.conf file.
> The output of testparm and the global section is below.
>> # testparm
>> Load smb config files from /etc/samba/smb.conf
>> Loaded services file OK.
>> Server role: ROLE_DOMAIN_MEMBER
>>
>> Press enter to see a dump of your service definitions
>>
>> # Global parameters
>> [global]
>>         log file = /var/log/samba/log.%m
>>         max log size = 1000
>>         name resolve order = wins bcast host
>>         panic action = /usr/share/samba/panic-action %d
>>         security = DOMAIN
>>         server string = %h file server (Samba, Ubuntu)
>>         template shell = /bin/bash
>>         winbind enum groups = Yes
>>         winbind enum users = Yes
>>         winbind use default domain = Yes
>>         wins proxy = Yes
>>         wins server = 192.168.1.24
>>         workgroup = ATLANTA
>>         idmap config * : range = 10000-20000
>>         idmap config * : backend = tdb
>>         admin users = administrator rob
>>         hosts allow = 192.168.1.0/255.255.255.0
> I think it likely that the problem is caused by changes in the Ubuntu 
> networking.


Probably not, what did change were these two lines in smb.conf:

client min protocol = SMB2_02
server min protocol = SMB2_02

Previously they were:

client min protocol = CORE
server min protocol = LANMAN1

Try setting them both to NT1

Once you have your NT4-style domain working again, I suggest you start 
planning to upgrade it to a Samba AD domain, the NT4-style domains are 
going away, possibly even as early as Samba 4.15.0

Rowland