[Bug 1573221] Re: Regression on 4.3.8 upgrade: clients fail to connect

[Marco van Zwetselaar]

I just downgraded back to 4.1.6, hoping to get our domain controllers
operational again, but the samba-ad-dc service fails to start with:
Unknown process model 'standard'.

In the smbd log file (attached) I note entries "msg: schema: metadata
tdb not initialized at
../source4/dsdb/samdb/ldb_modules/schema_load.c:117". This seems to
suggest a backwards-incompatible database change from 4.1.6 to 4.3.8
makes reverting impossible?

Is there a way to return to a working situation while this bug is being
fixed? These are production domain controllers ...


** Attachment added: "downgraded 4.1.6 smbd log"
   https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1573221/+attachment/4642493/+files/downgraded.smbd.log

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Title:
  Regression on 4.3.8 upgrade: clients fail to connect

Status in samba package in Ubuntu:
  Confirmed

Bug description:
  Since the upgrade from 4.1.6 to 4.3.8 on our Samba domain controllers
  on Ubuntu 14.04, clients fail to connect. Tested with Windows 7,
  Windows Server 12 and Samba clients.

  $ smbclient -L dc01 -U Administrator
  session setup failed: NT_STATUS_OBJECT_NAME_NOT_FOUND

  In the server logs I see:
      smbd[20632]: [2016/04/21 21:05:43.093606,  1] ../source3/smbd/sesssetup.c:281(reply_sesssetup_and_X_spnego)
      smbd[20632]:   Failed to generate session_info (user and group token) for session setup: NT_STATUS_OBJECT_NAME_NOT_FOUND

  The Windows clients cannot access shares and (quite critically) the
  RSAT tools such as ADUC can't be used to manage the domain.

  May be related to bug #1572301 where issues from other client
  platforms are reported.

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