So. The PowerDNS 3.3 as salve works only on local. (Also there is a nginx which works fine)
This work good
dig example.com A @127.0.0.1
But this not (slave server)
dig example.com A @ns2.example.com
;; global options: +cmd
;; connection timed out; no servers could be reached
I've tried with IP of ns2.example.com, but no good result anything.
Where the problem might be?
There was a problem in pdns-recursor config.
So, you need write your real IP address OR 0.0.0.0 instead of 127.0.0.1 in local-address property.