Have you considered lowering the unprivileged port limit instead?
sudo sysctl -w net.ipv4.ip_unprivileged_port_start=53 | sudo tee -a /etc/sysctl.conf
Then remove the firewall rule and bind to port 53.
Edit: typo
Have you considered lowering the unprivileged port limit instead?
Then remove the firewall rule and bind to port 53.
Edit: typo