wiki/docs/Debian/port-53-in-use.md

Port in use (connman)

Problem

When trying to run DNS thing, connman is already using port 53.

docker compose up --detach --build --remove-orphans
[+] Running 0/1
 ⠿ Container pihole  Starting                                                       0.2s
Error response from daemon: driver failed programming external connectivity on endpoint pihole (bc535387671f0d471f11f8ade5eedc4771126c057e2099931e8ef49461111149): Error starting userland proxy: listen tcp4 0.0.0.0:53: bind: address already in use

Solution

• Find the connman.service file:

grep -Ril "connman" /etc/systemd/

• Add --nodnsproxy to the ExecStart line:

ExecStart=/usr/sbin/connmand -n --nodnsproxy

• Reload and restart stuff:

systemctl daemon-reload
systemctl restart connman.service

• Try your thing again. For example:

docker compose up -d --remove-orphans