according to Bug 2889 after upgrade debian to jessie starts issue

Mon Jul 13 23:14:34 CEST 2015

hi there after upgrade debian from whezie to jessie (used kolab 3.4) i 
have the same issue as described in bug 2889

[13-Jul-2015 22:56:42,000000 +0200]: Login failure for user user at domain 
from ip.ad.dr.ess in session  (error LDAP not ready)

and nothing more on errors, try to investigate where is generater (then 
related error) but dont have any clue.
i dont think its about addressbook because i have on roudncubemail 
working contacts,tasks, and all.
after upgrading debian only activesync stops working.

cheers
komputersat