Hey, thanks.
That is it, I waited for an about one hour but it didn’t stop. I had to destroy the job via rails and tried to configure LDAP Sync again and again with another settings but it didn’t work no matter what I did.
It’s very sad, I would like to implement Zammad at my workplace, but there are so many problems.
Update:
I’ve installed Zammad one more time, this time via package. The migrate from OTRS was faster. And then I was able to integrate LDAP. I’ve used another DC-server, Windows 2016 and ist has worked without any problems.
I don’t know it was because of installation via package or of another server OS but the idea for another DC-server was very good. Thank you @TomGem !