Hello, I am running Unbound on FreeBSD, initially 10.3 and now 11, I tried the one on the FreeBSD Base, and now the Port (unbound-1.5.10) compiled with libevent support. The problem I am experiencing is, from time to time unbound become utterly slow or do not resolve anything, or almost anything. I did several changes on unbound.conf file and the problem now return about one time a day when just me (one user) is using Unbound as resolver. If a second user begin to using Unbound at same time it became slow as described until it have just one user again. I opened a post on FreeBSD forum, what have more information: https://forums.freebsd.org/threads/57493/ I need to add I also tried without success to disable PF firewall looking for any kind of firewall related issue. Also, this is my current unbound.conf: # This file was generated by local-unbound-setup. # Modifications will be overwritten. server: port: 53 username: unbound directory: /usr/local/etc/unbound chroot: /usr/local/etc/unbound pidfile: /usr/local/etc/unbound/unbound.pid auto-trust-anchor-file: /usr/local/etc/unbound/root.key root-hints: "/usr/local/etc/unbound/root.hints" logfile: log/unbound.log log-time-ascii: yes val-log-level: 2 do-ip6: no do-tcp: yes interface: 127.0.0.2 interface: 192.168.0.220 access-control: 127.0.0.2/16 allow access-control: 192.168.0.0/24 allow private-address: 192.168.0.0/24 private-domain: mydomain.com qname-minimisation: yes minimal-responses: no hide-identity: yes hide-version: yes do-not-query-localhost: no val-clean-additional: yes harden-glue: yes harden-dnssec-stripped: yes unwanted-reply-threshold: 10000 prefetch: yes prefetch-key: yes cache-min-ttl: 3600 cache-max-ttl: 86400 num-threads: 4 msg-cache-slabs: 8 rrset-cache-slabs: 8 infra-cache-slabs: 8 key-cache-slabs: 8 rrset-cache-size: 100m msg-cache-size: 50m outgoing-range: 8192 num-queries-per-thread: 4096 so-rcvbuf: 1m so-sndbuf: 1m unblock-lan-zones: yes insecure-lan-zones: yes include: /usr/local/etc/unbound/conf.d/*.conf #forward-zone: # name: . # forward-addr: 184.108.40.206 # forward-addr: 220.127.116.11 remote-control: control-enable: yes control-interface: /usr/local/etc/unbound/unbound.ctl control-use-cert: no Thank you! Alex.