[Samba] In Samba logs, I get " check_account: Failed to convert" or "check_account: Failed to find local account" error messages.

[Rowland Penny]

On Mon, 2022-04-18 at 03:25 -0400, Mark London via samba wrote:
> Hi - On an older Ubuntu 18 computer, I tried to configure Samba,
> whose 
> latest version available for Ubuntu 18 is Samba 4.7.6.   I
> successfully 
> joined to our windows domain, according to all commands that I've
> run, 
> including wbinfo.   I am running SSSD for domain login access, which 
> works fine.

Sorry, but Samba cannot provide support for sssd, because Samba does
not produce it.

>   But when I try to connect from a Windows 10 computer to the 
> Samba server, it says user and password is correct, and prompts for 
> username and password again.   It still says that it is
> incorrect.   The 
> samba log for that node, initially showed me this error:
> 
> [2022/04/18 01:28:38.164874,  0] 
> ../source3/auth/auth_util.c:1259(check_account)
>    check_account: Failed to convert SID 
> S-1-5-21-1078081533-1580818891-1957994488-2127 to\
>   a UID (dom_user[PSFC\mrl])
> 
> I couldn't find any any solution on the web that useful.     Then 
> something I did, caused the error message to change to this:

What did you do ???

> 
> [2022/04/18 02:05:39.810294,  0] 
> ../source3/auth/auth_util.c:1267(check_account)
>    check_account: Failed to find local account with UID 3000 for SID 
> S-1-5-21-1078081533-\
> 1580818891-1957994488-2127 (dom_user[PSFC\mrl])
> 
> I don't have a solution to this error either.  I don't know what to
> try 

You have provided us with very little to work with, so can you post the
output of 'testparm -s'

Have you a reason for not updating to 20.04 ? That would get you Samba
4.13.x and 4.7.6 is ancient in Samba terms.

Rowland