Hello, After a upgrade from powerdns-recursor-3.7.3-3 to powerdns-recursor-4.0.3-1 it does not return any dns queries anymore. In the daemon.log is logged: Oct 23 10:50:18 gateway001 pdns_recursor[3008]: Oct 23 10:50:18 Sending SERVFAIL to 10.3.3.134 during resolve of 'google.nl' because: more than 50 (max-qperq) queries sent while resolving ns1.google.com Oct 23 10:50:19 gateway001 pdns_recursor[3008]: Oct 23 10:50:19 Sending SERVFAIL to 10.3.3.134 during resolve of 'google.nl' because: more than 50 (max-qperq) queries sent while resolving ns2.google.com After a downgrade of powerdns-recursor-4.0.3-1 to 3.7.3-3 it is working again, without making changes to /etc/powerdns/recursor.conf. The customized configuration options in /etc/powerdns/recursor.conf: [root@gateway001 powerdns]# grep -v -e "#.*" recursor.conf | grep -e "..*" allow-from=127.0.0.0/8, 10.0.0.0/8, ::1/64, 2001:470:1f15:a09::/64, 2001:470:7b9a::/48 auth-zones=.=/etc/powerdns/root.zone forward-zones=domain.lan=10.3.0.1,home.lan=10.3.0.21 hint-file=/etc/powerdns/named.root local-address=127.0.0.1,10.3.0.253:53,[::1],[2001:470:7b9a:0a03::fd]:53 local-port=5353 log-common-errors=yes loglevel=9 pdns-distributes-queries=yes query-local-address6=:: Do I need something to change to make it working against 4.0.x? I've searched at powerdns.com to options that have changed in the configuration but nothing helped. Kind regards, Roel de Wildt