samba - Nov 2020 - samba-tool domain backup online fails with uncaught exception - list index out of range

Hello,

I have joined a Samba DC (dc2.corp.domain.com) to an existing Samba domain
with a single DC (dc1.corp.domain.com).

Once joined, I wanted to test an online backup so ran:

root at dc2:~# samba-tool domain backup online --targetdir=backupdir
--serverdc2.corp.domain.com -Uadministrator

which displays many messages but results in the following error without a
completed backup:

ERROR(<class 'IndexError'>): uncaught exception - list index out
of range
  File "/usr/lib/python3/dist-packages/samba/netcmd/__init__.py", line
186,
in _run
    return self.run(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/samba/netcmd/domain_backup.py",
line
258, in run
    new_sid = get_sid_for_restore(remote_sam)
  File "/usr/lib/python3/dist-packages/samba/netcmd/domain_backup.py",
line
81, in get_sid_for_restore
    rid = int(res[0].get('rIDNextRID')[0])

If I run the same command on the same server but specify
--serverdc1.corp.domain.com, the backup runs without error:

root at dc2:~# samba-tool domain backup online --targetdir=backupdir
--serverdc1.corp.domain.com -Uadministrator

Can any one tell me what might be causing this and how it can be fixed?

Many thanks.

Kind regards,

Stacey Richards

Synapp NZ Limited
Email stacey at synapp.nz
Mobile +64 22 580 0258
Skype stacey.richards