LDAP-Problems after Update Kolab 16

[Roland Kolb]

Hi all,

after the update of Kolab 16 (Centos7) I get problems connecting to Kolab.

A few times per day the connection to the ldap server will be lost. A 
login to a mail account isn't possible. After about 30min the connection 
to the ldap server is possible again and also a login the the mail account.
When I lool into the log files I found

kolab postfix/trivial-rewrite[21915]: warning: dict_ldap_lookup: Search 
error -5: Timed out
kolab postfix/trivial-rewrite[21915]: warning: 
ldap:/etc/postfix/ldap/mydestination.cf: table lookup problem

Has somebody an idea what happens why the connection will be lost? My 
ldap-server

389-ds-base.x86_64           (1.3.4.0-32.el7_2)
389-ds-base-libs.x86_64    (1.3.4.0-32.el7_2)

Thanks

Roland