Yes, I found that in hosts.cgi, too. And I found this thread regarding slow restart of unbound and this DNS blocking script: [issue] unbound restart / reboot need to long after update 139->141 - #2 by jayjay73
Unbound seems to be the “problem” in my configuration. I restarted it manually and noticed that this takes so long. My reboot are slow, too.
Maybe I could have a look at the bugtracker and write a change request regarding that.
Thanks for your help 
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