DNS trouble with pihole running with podman

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Hi people.
I am running pihole under podman and its dedicated system account on my NAS. Now, from the NAS, I get a connection refused on ip.of.the.nas:53 but everywhere else in my network, pihole works perfectly.
To run pihole as a rootless container, i made it listen on 1053 and I have a firewall redirection from 53 to 1053 for both udp and tcp.
Any pointer to where (and how) I can debug this ?

Edit: Small precision about my current setup : ISP router (so I can't really do anything on it) and NAS running opensuse leap

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edited

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

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