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I set up pi-hole with unbound on my ubuntu 18.04 machine. I followed the instructions by pi-hole[1].

Clients can reach websites with this method but after some time I get timeouts. Pihole is still forwarding requests to 127.0.0.1 but it seems that unbound doesn't answer anymore. Even on the host machine I get timeouts.

dig pi-hole.net @127.0.0.1 -p 5353

; <<>> DiG 9.11.3-1ubuntu1.8-Ubuntu <<>> pi-hole.net @127.0.0.1 -p 5353
;; global options: +cmd
;; connection timed out; no servers could be reached

Only systemctl restart unbound solves this problem. Unbound is still running and doesn't show any obvious errors though. I posted on the pi-hole forums and added quite some information there so you might want to check the thread [2].

[1] https://docs.pi-hole.net/guides/unbound/

[2] https://discourse.pi-hole.net/t/pihole-on-ubuntu-18-04-with-unbound-fails-after-some-time/22585

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