Clear DNS Cache
Cache is automatically cleared by restarting the
Settings › Restart DNS resolver
This may happen with major changes between pi-hole versions, especially with
FTLDNS; which may leave the system with a permenant DNS server not started
Backup all files in Files.
Reinstall the Pi-Hole server and setup vanilla. Then copy the following files to
do a manual teleporter install.
5.x may be exported to 4.x flat
files if needed. A teleporter install in
5.x will not carry over all
PiHole list/group/client settings
Current DHCP leases (optional)
SQLite DNS resolution log (optional)
pihole-FTL.conf and anything in
probably different if the upgrade failed. Diff these and make a determination