After some more test I must conclude that a simple reboot also break the dns. E.g. no need to do a "signal-event post-upgrade".
I did not see this before as it is not that often I need to reboot the server 
You are completely missing the point here.
Once you restore your settings are borked because something is wrong on v9, and hence your backup, which means the v10 system is unable to run the dns services correctly. Read my comments above, and read your logs.
Nothing will fix that.
You set a manual DNS which bodges it's way round the real issue which is borked users & dns services, but doesn't fix it.
Some solutions:
1. Fix your v9 before backup (still not seen logs from there)
2. Copy data manually and re-create users
3. Restore v9 from known good backup, then migrate
Note the templates & newrpms we want are from v9, not v10, so we can try and see how and what you broke on v9.
That is where the real issue lies. All the issues with v10 are due to broken data from v9.
We are unlikely to be able to fix your v10 currently.
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