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FedKad
Asked: 2024-11-08 22:07:21 +0800 CST

Custom ssh port configuration will listen only on IPv6 of the system

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After today's update of openssh-server (1:9.6p1-3ubuntu13.5 ⇒ 1:9.6p1-3ubuntu13.7) any custom port definition on systemctl edit ssh.socket configuration like this will not cause ssh.socket to listen on the IPv4 of the system:

ListenStream=2222

init will listen only on the IPv6 of the system.

24.04

1 Answers

  1. Best Answer

    One solution is to put two lines like these when editing with the systemctl edit ssh.socket command:

    [Socket]
ListenStream=0.0.0.0:2222
ListenStream=[::]:2222

    and run

    # systemctl restart ssh.socket

    The cause of this change is the addition of

    BindIPv6Only=ipv6-only

    to the default configuration at /usr/lib/systemd/system/ssh.socket.

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