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

[Joshua Powers]

Trusty updates has 4.3.11 now, given the above comment moving to
incomplete.

If you disagree or have additional details please add them below and
then change the bug status back to New.

** Changed in: samba (Ubuntu)
       Status: Confirmed => Incomplete

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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:
  Incomplete

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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