And then, all of a sudden, yesterday at 11:38, PiHole stopped servicing

[HvdW]

Please follow the below template, it will help us to help you!

Expected Behaviour:

[Running as usual]

Actual Behaviour:

[Not forwarding DNS requests from clients on the LAN
I don't know what happened. As far as I remember there was nothing special, no change on the RPI, no change in the network.
Picture shows requests before and after. Before different clients, after just localhost.
O btw, no IP#'s as I edited /etc/hosts]

Debug Token:

[https://tricorder.pi-hole.net/lenncph3s4]

[RamSet]

Based on your debug log, looks like something did happen there as your selected/set interface (tun0) is no longer available.

As well as everything tied to network connectivity...

Run a pihole -r and reconfigure to the eth0 interface and give it a spin after that.

[HvdW]

That's swift! I'll do so.
I'll dive into the RPI logs as well.

Is this helpfull?

Feb 17 11:38:14 RPI3 systemd[1]: Stopping LSB: pihole-FTL daemon...
Feb 17 11:38:14 RPI3 systemd[1]: session-c1.scope: Succeeded.
Feb 17 11:38:14 RPI3 pihole-FTL[19350]: Stopped
Feb 17 11:38:14 RPI3 systemd[1]: pihole-FTL.service: Succeeded.
Feb 17 11:38:14 RPI3 systemd[1]: Stopped LSB: pihole-FTL daemon.
Feb 17 11:38:14 RPI3 systemd[1]: Starting LSB: pihole-FTL daemon...
Feb 17 11:38:14 RPI3 pihole-FTL[19380]: Not running
Feb 17 11:38:15 RPI3 systemd[1]: Started Session c8 of user pihole.
Feb 17 11:38:15 RPI3 pihole-FTL[19380]: FTL started!
Feb 17 11:38:15 RPI3 systemd[1]: Started LSB: pihole-FTL daemon.
Feb 17 11:39:00 RPI3 systemd[1]: Starting Clean php session files...
Feb 17 11:39:00 RPI3 systemd[1]: phpsessionclean.service: Succeeded.
Feb 17 11:39:00 RPI3 systemd[1]: Started Clean php session files.
Feb 17 11:39:02 RPI3 CRON[19589]: (root) CMD (  [ -x /usr/lib/php/sessionclean ] && if [$
Feb 17 11:40:01 RPI3 CRON[19686]: (root) CMD (   PATH="$PATH:/usr/local/bin/" pihole upd$
Feb 17 11:40:34 RPI3 SBFspotUploadDaemon[631]: Unable to write to logfile [/ho

And there's a warning too:
DataTables warning: table id=all-queries - Requested unknown parameter '3' for row 94, column 3. For more information about this error, please see http://datatables.net/tn/4

[HvdW]

I have applied the classic solution

• uninstall piHole
• restart
• install PiHole

What I encounter is that it is necessary to manually set PIHOLE_INTERFACE=wg0
in /etc/pihole/setupVars.conf
I had forgotten that it fails there every now and then, with install as well as when changing settings in the admin interface.

[HvdW]

OK, as mentioned before a did another run.
Again PiHole DNS server stopped.
` sudo service pihole-FTL status
● pihole-FTL.service - LSB: pihole-FTL daemon
Loaded: loaded (/etc/init.d/pihole-FTL; generated)
Active: active (exited) since Thu 2020-02-20 17:27:36 CET; 8h ago
Docs: man:systemd-sysv-generator(8)
Process: 15395 ExecStart=/etc/init.d/pihole-FTL start (code=exited, status=0/S

feb 20 17:27:25 RPI3 systemd[1]: Starting LSB: pihole-FTL daemon...
feb 20 17:27:25 RPI3 pihole-FTL[15395]: Not running
`
After that: sudo service pihole-FTL stop, sudo service pihole-FTL start, sudo service pihole-FTL status giving the same output.
Running DNSbench from Windows gives me this picture:
It should be like this:

How come it stops after having done it's job for half a day.
Here's the debug token: https://tricorder.pi-hole.net/irmriezne0

O, almost forgot: admin shows this

and terminal shows this:

● pihole-FTL.service - LSB: pihole-FTL daemon
   Loaded: loaded (/etc/init.d/pihole-FTL; generated)
   Active: active (exited) since Fri 2020-02-21 01:54:58 CET; 6s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 10802 ExecStart=/etc/init.d/pihole-FTL start (code=exited, status=0/SUCCESS)

feb 21 01:54:47 RPI3 systemd[1]: Starting LSB: pihole-FTL daemon...
feb 21 01:54:47 RPI3 pihole-FTL[10802]: Not running
feb 21 01:54:57 RPI3 su[10872]: (to pihole) root on none
feb 21 01:54:57 RPI3 su[10872]: pam_unix(su:session): session opened for user pihole by (uid=0)
feb 21 01:54:58 RPI3 pihole-FTL[10802]: FTL started!
feb 21 01:54:58 RPI3 su[10872]: pam_unix(su:session): session closed for user pihole
feb 21 01:54:58 RPI3 systemd[1]: Started LSB: pihole-FTL daemon.