I first noticed that I could not ssh to my host, was getting connection refused error. Then I tried to connect over IPv6 address and it worked. I checked with `ss -tlnp | grep 22` and found out that sshd was only listening on [::]:22. Then I tried almost everything to bind it to 0.0.0.0 without any luck. Even when I only specified 0.0.0.0 as bind interface, it was still binding to [::] instead.
I also noticed that my manually compiled sslh behaved the same way. Last time it was compiled on Ubuntu 22.04, so I decided to rebuild it on 24.04 and it started to work properly. I believe, there was some change in libc which either requires all network related software recompiled from source. Because like I said, almost every network related software behaves the same. While net.ipv6.bindv6only=0 is the default, it doesn't explain why net.ipv6.bindv6only=1 works incorrectly. It is not supposed to replace 0.0.0.0 with [::], it is supposed to stop applications to bind to IPv4 interfaces when they are configured to bind to [::] only explicitly. Also, it doesn't explain why recompiling applications from source fixes the issue. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2080216 Title: sshd cannot bind to IPv4 interfaces To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/2080216/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
