I also verified the fix using a fresh noble container:
root@n:~# apt policy openssh-server
openssh-server:
Installed: 1:9.6p1-3ubuntu13.13
Candidate: 1:9.6p1-3ubuntu13.13
Version table:
*** 1:9.6p1-3ubuntu13.13 100
100 http://archive.ubuntu.com/ubuntu noble-proposed/main amd64 Packages
100 /var/lib/dpkg/status
1:9.6p1-3ubuntu13.12 500
500 http://archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages
1:9.6p1-3ubuntu13.11 500
500 http://security.ubuntu.com/ubuntu noble-security/main amd64 Packages
1:9.6p1-3ubuntu13 500
500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages
1. Check the default:
root@n:~# lsof -i :22
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
systemd 1 root 47u IPv4 2258326 0t0 TCP *:ssh (LISTEN)
systemd 1 root 48u IPv6 2258327 0t0 TCP *:ssh (LISTEN)
2. Check that AddressFamily works for IPv4 only:
root@n:~# echo "AddressFamily inet" >> /etc/ssh/sshd_config.d/custom.conf
root@n:~# systemctl daemon-reload
root@n:~# systemctl restart ssh.socket
root@n:~# lsof -i :22
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
systemd 1 root 47u IPv4 2259275 0t0 TCP *:ssh (LISTEN)
3. Check that AddressFamily works for IPv6 only (with a non-default port
for good measure):
root@n:~# echo "AddressFamily inet6" > /etc/ssh/sshd_config.d/custom.conf
root@n:~# echo "Port 1234" >> /etc/ssh/sshd_config.d/custom.conf
root@n:~# systemctl daemon-reload
root@n:~# systemctl restart ssh.socket
root@n:~# lsof -i :1234
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
systemd 1 root 47u IPv6 2263137 0t0 TCP *:1234 (LISTEN)
root@n:~# lsof -i :22
4. Lastly, the new dep8 tests added are passing, e.g.
https://autopkgtest.ubuntu.com/results/autopkgtest-
noble/noble/arm64/o/openssh/20250702_155647_cf67f@/log.gz:
2090s autopkgtest [15:52:15]: test sshd-socket-generator: preparing testbed
2090s Reading package lists...
2090s Building dependency tree...
2090s Reading state information...
2090s Starting pkgProblemResolver with broken count: 0
2090s Starting 2 pkgProblemResolver with broken count: 0
2090s Done
2091s 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2092s autopkgtest [15:52:17]: test sshd-socket-generator:
[-----------------------
2092s test_default...PASS
2092s test_custom_port...PASS
2092s test_default_and_custom_port...PASS
2092s test_mutiple_custom_ports...PASS
2092s test_custom_listenaddress...PASS
2092s test_custom_listenaddress_and_port...PASS
2092s test_custom_ipv6_listenaddress...PASS
2092s test_match_on_port...PASS
2092s test_custom_family_ipv4...PASS
2092s test_custom_family_ipv6...PASS
2092s test_custom_port_and_family_ipv4...PASS
2092s test_custom_port_and_family_ipv6...PASS
2093s autopkgtest [15:52:18]: test sshd-socket-generator:
-----------------------]
2093s autopkgtest [15:52:18]: test sshd-socket-generator: - - - - - - - - - -
results - - - - - - - - - -
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https://bugs.launchpad.net/bugs/2080216
Title:
sshd cannot bind to IPv4 interfaces
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