# Unknown error on Pi-hole
**URL:** https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267
**Category:** Troubleshooting
**Created:** [7 September 2022 13:39 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267 "2022-09-07T13:39:59Z")
**Posts on this page:** 17
**Page:** 1
### Author:  [@pihunt](https://dietpi.com/forum/u/pihunt)
#### Post date: [7 September 2022 13:39 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/1 "2022-09-07T13:39:59Z")
### Creating a bug report/issue
Hi All,
My Pi-hole started showing an unknown error message when I want to see the query log. I can’t find a solution so I’d like some help. I’m running this server on a Raspberry Pi 4, on DietPi v8.8.1 OS.
I took a couple of screenshots about the issue:
[Screenshot 1](https://ibb.co/nBy7QJL)
[Screenshot 2](https://ibb.co/8BdDHXN)
[Screenshot 3](https://ibb.co/1s0TyPj)
#### Required Information
- DietPi version | `G_DIETPI_VERSION_CORE=8 G_DIETPI_VERSION_SUB=8 G_DIETPI_VERSION_RC=1 G_GITBRANCH='master' G_GITOWNER='MichaIng'`
- Distro version | `bullseye 0`
- Kernel version | `Linux MediaServer 5.15.61-v8+ #1579 SMP PREEMPT Fri Aug 26 11:16:44 BST 2022 aarch64 GNU/Linux`
- SBC model | `RPi 4 Model B (aarch64)`
#### Additional Information (if applicable)
- Software title | Pi-hole
- Was the software title installed freshly or updated/migrated?
Fresh install
- Can this issue be replicated on a fresh installation of DietPi?
Yes
- Bug report ID | `7f86b7f5-e07f-464f-a296-64ae49134e90`
---
### Author:  [@Jappe](https://dietpi.com/forum/u/Jappe)
#### Post date: [7 September 2022 15:53 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/2 "2022-09-07T15:53:26Z")
Hello, can you post the output of:
```auto
ss -tulpn | grep :53
```
This checks if another service (e.g. dnsmasq) is listening on port 53 and prevent pihole-ftl from working.
---
### Author:  [@Joulinar](https://dietpi.com/forum/u/Joulinar)
#### Post date: [7 September 2022 19:15 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/3 "2022-09-07T19:15:24Z")
I guess issue is inside PiHole application and not with the DNS server in genral. Maybe a problems with query database. You could try to delete the current db file and let PiHole create a new fresh one
---
### Author:  [@pihunt](https://dietpi.com/forum/u/pihunt)
#### Post date: [10 September 2022 13:13 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/4 "2022-09-10T13:13:32Z")
Hi! This is the output:
```auto
root@MediaServer:~# ss -tulpn | grep :53
udp UNCONN 0 0 0.0.0.0:5335 0.0.0.0:* users:(("unbound",pid=887,fd=3))
udp UNCONN 0 0 0.0.0.0:5353 0.0.0.0:* users:(("java",pid=5180,fd=189))
udp UNCONN 0 0 0.0.0.0:5353 0.0.0.0:* users:(("java",pid=5180,fd=183))
udp UNCONN 0 0 0.0.0.0:5353 0.0.0.0:* users:(("java",pid=5180,fd=182))
udp UNCONN 0 0 0.0.0.0:5353 0.0.0.0:* users:(("java",pid=5180,fd=181))
udp UNCONN 0 0 0.0.0.0:5353 0.0.0.0:* users:(("java",pid=5180,fd=180))
udp UNCONN 0 0 0.0.0.0:5355 0.0.0.0:* users:(("systemd-resolve",pid=594,fd=11))
udp UNCONN 0 0 172.24.0.1:53217 0.0.0.0:* users:(("Plex Media Serv",pid=4873,fd=99))
udp UNCONN 0 0 127.0.0.1:53 0.0.0.0:* users:(("pihole-FTL",pid=1150,fd=8))
udp UNCONN 0 0 192.168.1.5:53 0.0.0.0:* users:(("pihole-FTL",pid=1150,fd=6))
udp UNCONN 0 0 0.0.0.0:53792 0.0.0.0:* users:(("connectd",pid=893,fd=5))
udp UNCONN 0 0 *:5355 *:* users:(("systemd-resolve",pid=594,fd=13))
tcp LISTEN 0 4096 0.0.0.0:5355 0.0.0.0:* users:(("systemd-resolve",pid=594,fd=12))
tcp LISTEN 0 32 127.0.0.1:53 0.0.0.0:* users:(("pihole-FTL",pid=1150,fd=9))
tcp LISTEN 0 32 192.168.1.5:53 0.0.0.0:* users:(("pihole-FTL",pid=1150,fd=7))
tcp LISTEN 0 256 0.0.0.0:5335 0.0.0.0:* users:(("unbound",pid=887,fd=4))
tcp LISTEN 0 4096 [::]:5355 [::]:* users:(("systemd-resolve",pid=594,fd=14))
```
---
### Author:  [@pihunt](https://dietpi.com/forum/u/pihunt)
#### Post date: [10 September 2022 13:15 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/5 "2022-09-10T13:15:00Z")
I asked help from Pi-hole support and they directed me here, because I use Dietpi… How can I delete the current db?
---
### Author:  [@Jappe](https://dietpi.com/forum/u/Jappe)
#### Post date: [10 September 2022 14:32 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/6 "2022-09-10T14:32:05Z")
The db is at `/etc/pihole/pihole-FTL.db` and can be removed with
```auto
rm /etc/pihole/pihole-FTL.db
```
---
### Author:  [@Joulinar](https://dietpi.com/forum/u/Joulinar)
#### Post date: [10 September 2022 15:01 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/7 "2022-09-10T15:01:11Z")
Yeah don’t forget to stop PiHole FTL service before.
Could you link the post from PiHole forum?
---
### Author:  [@pihunt](https://dietpi.com/forum/u/pihunt)
#### Post date: [13 September 2022 09:52 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/8 "2022-09-13T09:52:52Z")
Thank you! I was able to remove the pihole-FTL.db. Let’s see what happens next!
---
### Author:  [@pihunt](https://dietpi.com/forum/u/pihunt)
#### Post date: [13 September 2022 09:54 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/9 "2022-09-13T09:54:36Z")
Of course! [This is a Reddit link.](https://www.reddit.com/r/pihole/comments/ws0g9r/an_unknown_error_occurred_while_loading_the_data/)
---
### Author:  [@Joulinar](https://dietpi.com/forum/u/Joulinar)
#### Post date: [13 September 2022 12:08 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/10 "2022-09-13T12:08:05Z")
Did you generate the Debug log for the PiHole guys as they requested on Reddit? I see this request open for 25 days but somehow no answers from your side.
---
### Author:  [@MichaIng](https://dietpi.com/forum/u/MichaIng)
#### Post date: [13 September 2022 13:43 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/11 "2022-09-13T13:43:29Z")
Also check `/var/log/pihole.log` and `/var/log/pihole-FTL.log` for entries right after triggering the error.
Also, can you scroll the error message at the web UI? If so, probably there is some more meaningful line at the end.
---
### Author:  [@pihunt](https://dietpi.com/forum/u/pihunt)
#### Post date: [14 September 2022 02:45 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/12 "2022-09-14T02:45:28Z")
Since they have redirected me to the Dietpi forum, I didn’t followed the post anymore. I have deleted the pihole-FTL.db and then started Pi-Hole again, I’m still experiencing the same thing. I’ve scrolled down in the error message window and there was no useful information.
---
### Author:  [@Joulinar](https://dietpi.com/forum/u/Joulinar)
#### Post date: [14 September 2022 11:02 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/13 "2022-09-14T11:02:28Z")
Could you explain where exactly the issue happens? For me this is something inside the PiHole application and I’m not 100% sure how we could fix it from our side. You could try to perform a reinstall. Maybe there is an issue on the PiHole scripts that could be fixed by performing a reinstall.
---
### Author:  [@pihunt](https://dietpi.com/forum/u/pihunt)
#### Post date: [14 September 2022 12:33 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/14 "2022-09-14T12:33:33Z")
It happens when I go inside long term data, then Query Log and when I Select date and time range and select a range… Sometimes I don’t get this error message, but most often I do.
I have reinstalled Pi-Hole now, set it as a DHCP server and unchecked Conditional forwarding, checked DNSSEC validation. Since that error occurred randomly, I let Pi-Hole to work for a bit and test it again. Thank you for trying to help me!
---
### Author:  [@MichaIng](https://dietpi.com/forum/u/MichaIng)
#### Post date: [15 September 2022 05:17 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/15 "2022-09-15T05:17:15Z")
Do the log files I posted above show any related entries? Check them shortly after you faced the issue.
And so check:
```nohighlight
dmesg -l emerg,alert,crit,err
```
---
### Author:  [@pihunt](https://dietpi.com/forum/u/pihunt)
#### Post date: [15 September 2022 10:44 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/16 "2022-09-15T10:44:11Z")
Thank you for your help! Since I reinstalled Pi-Hole (\<24 hrs ago), I don’t get this unknown error message.
For `dmesg -l emerg,alert,crit,err`
- I get the following:
```auto
[2.627142] sd 1:0:0:0: [sdc] No Caching mode page found
[2.627154] sd 1:0:0:0: [sdc] Assuming drive cache: write through
```
These has been always present on my system.
---
### Author:  [@Joulinar](https://dietpi.com/forum/u/Joulinar)
#### Post date: [15 September 2022 13:34 UTC](https://dietpi.com/forum/t/unknown-error-on-pi-hole/14267/17 "2022-09-15T13:34:34Z")
> [@pihunt](#):
>
> Since I reinstalled Pi-Hole (\<24 hrs ago), I don’t get this unknown error
Probably some issues on PiHole files that hopefully got fixed due to reinstall.