[Samba] Strange problem with winbind on linux domain member (works for 2 minutes...)

[Rowland Penny]

On Thu, 5 Feb 2026 14:19:40 +0100
Jakob Curdes via samba <samba at lists.samba.org> wrote:

> Hello, after upgrading a samba4 AD domain member server on ubuntu24 
> (Re-joined with same name, but probably unrelated), I expreience a 
> strange behavior.
> 
> When starting all three services smbd,nmbd,winbind, everything works. 
> Then after about 2 minutes, the shares are not accessible any more,
> and winbind shows an error message on systemctl status:
> 
> Feb 05 13:35:01 *** winbindd[3131]: [2026/02/05 13:35:01.392619, 0] 
> source3/winbindd/winbindd_samr.c:71(open_internal_samr_conn)
> Feb 05 13:35:01 *** winbindd[3131]:   open_internal_samr_conn: Could
> not connect to samr pipe: NT_STATUS_CONNECTION_DISCONNECTED
> 
> I first had the time sync as idea, but the server is in sync with DC
> and the workstations which are also domain members.
> Time zone is also the same.
> Other than this error I find no clues. All wbinfo tests succeed, 
> kerberos is fine, etc.
> 
> Probably relevant part of smb.conf (but this config is exactly the
> same as before the upgrade):
> 
>     winbind refresh tickets = Yes
>     dedicated keytab file = /etc/krb5.keytab
>     kerberos method = secrets and keytab
>     winbind use default domain = no
>     winbind enum users = yes
>     winbind enum groups = yes
>     winbind nested groups   = Yes
>     winbind expand groups   = 4
> 
> Any idea what could cause this? The DCs are also Ubuntu 24. We have
> no other known issues in the domain, but this actually the only LINUX 
> member server.
> I now restart winbind every minute via cron, but this is obviously a 
> workaround....
> 
> Best regards, Jakob

The entire smb.conf may be relevant, so can you please post the output
(sanitised if you must) of 'testparm -s'.

Rowland