# Unable to synchronize system time, Pi-hole not working

**URL:** <https://discourse.pi-hole.net/t/unable-to-synchronize-system-time-pi-hole-not-working/53805>\
**Category:** Help\
**Created:** [February 22, 2022, 2:05pm UTC](https://discourse.pi-hole.net/t/unable-to-synchronize-system-time-pi-hole-not-working/53805 "2022-02-22T14:05:29Z")\
**Posts on this page:** 1\
**Showing post:** 27

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**Author:** ![deHakkelaar](https://discourse-cdn.pi-hole.net/user_avatar/discourse.pi-hole.net/dehakkelaar/32/674_2.png) [@deHakkelaar](https://discourse.pi-hole.net/u/deHakkelaar)\
**Post date:** [February 25, 2022, 6:19am UTC](https://discourse.pi-hole.net/t/unable-to-synchronize-system-time-pi-hole-not-working/53805/27 "2022-02-25T06:19:08Z")

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> [@thofra01](#):
>
> ```auto
> dig sigok.verteiltesysteme.net @127.0.0.1 -p 5335
> 
> ; <<>> DiG 9.16.22-Raspbian <<>> sigok.verteiltesysteme.net @127.0.0.1 -p 5335
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 45557
> 
> ```

Have you installed the latest Raspbian/Pi-OS Bullseye?

`lsb_release -d`

If so, make sure you do below:

> [@Pi-hole Unbound and Cloudflare TLS](https://discourse.pi-hole.net/t/pi-hole-unbound-and-cloudflare-tls/53836/2):
>
> Have you hashed out below line: pi@ph5b:~ $ sudo nano /etc/resolvconf.conf [..] #unbound\_conf=/etc/unbound/unbound.conf.d/resolvconf\_resolvers.conf And deleted below file: pi@ph5b:~ $ sudo rm /etc/unbound/unbound.conf.d/resolvconf\_resolvers.conf rm: cannot remove '/etc/unbound/unbound.conf.d/resolvconf\_resolvers.conf': No such file or directory Above file configures unbound differently as you would expect creating a forward zone:

> [@thofra01](#):
>
> Even when I select the Pi as a custion IPv4 DNS server in Windows 10 no traffic is going through the Pi-hole.

Pi-hole needs to be the only DNS server for your clients:

> [@Why should Pi-hole be my only DNS server?](https://discourse.pi-hole.net/t/why-should-pi-hole-be-my-only-dns-server/3376):
>
> Reduced Ad Blocking Capability The main reason you should Pi-hole as your only DNS server is that you will see increased performance in the blocking of ads. If you have two DNS servers (Pi-hole and something else), your network clients may not always query Pi-hole for name resolution. If a query happens to be answered from a non-Pi-hole DNS server, your block lists will not apply (since that DNS server doesn't know about them). All Queries Need To Go Through Pi-hole First Since other DNS serv…

Check on this Win client what DNS servers are configured:

`netsh interface ip show dnsservers`

Or run below on this Win client to see what server it prefers currently:

`nslookup pi.hole`

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_[View the full topic](https://discourse.pi-hole.net/t/unable-to-synchronize-system-time-pi-hole-not-working/53805)._