UCS Member DC slow when 2nd DC offline


We are still in the process of replacing an old small business server.
A new Windows server takes over the domain.
Univention is a Member DC and provides Kopano.
The problem is:
We would like to disconnect the SBS for test purposes (maybe several days)
to see where he is still in use.
As soon as he is disconnected from the network, all domain-dependent services working
very slowly on the Univention.
This applies to opening and work in Kopano, open GAB, e.t.c.

During the Univention installation, only the new DC was specified and the roles had already been taken over at this point.

Nothing from the old server could be found in the UCR.
Can you help me?
Sorry for my bad English. :wink:

German post for reference: UCS AD Member / Kopano / LDAP langsam wenn alter DC offline

Hi @Raute,

is it only Kopano that is working slow or are there other services relying on LDAP that are slow?

What is the output of?

ucr get kopano/cfg/ldap/ldap_uri
ucr get ldap/server/name 

To more clearly see what is going on from the Kopano side you can adjust the logging in server.cfg to use 0x00020006 to enable user backend debug logging. This will show ldap connects, disconnects, query times etc.