[Bug 1357471] Re: Samba4 AD DC randomly dies, error: "Did not manage to negotiate mandetory feature SIGN for dcerpc auth_level 6".

[Jorge Albarenque]

I recently compiled and installed Samba v4.3.1 on Debian Jessie (from
the experimental repo) and I can confirm that this problem seems to have
been resolved (at least on that version, although probably since on
v4.2.x)

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Title:
  Samba4 AD DC randomly dies, error: "Did not manage to negotiate
  mandetory feature SIGN for dcerpc auth_level 6".

Status in samba package in Ubuntu:
  Confirmed

Bug description:
  Hello!

  I'm using Samba4 AD DC, from Ubuntu 14.04.1, it works almost
  flawlessly but, almost everyday, it dies.

  The error log begins to show:

  "Did not manage to negotiate mandetory feature SIGN for dcerpc
  auth_level 6"

  Then, the replication stops working, the domain stops responding and
  Windows guests do not authenticate, it becomes really messy.

  Here is the workaround:

  ---
  rm /var/log/samba/* ; service samba-ad-dc restart
  ---

  More info:

  https://lists.samba.org/archive/samba/2014-May/181193.html

  Issue: "samba" process uses excessive CPU time and generates high IO Wait. log.samba has many entries stating "Did not manage to negotiate mandetory feature SIGN for dcerpc":
  http://ghanima.net/doku.php?id=wiki:ghanima:healthandsecurity:samba4

  Thanks!
  Thiago

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